Wilayat of Ali (a.s.) is a Strong Fort of Allah

The tradition explaining this concept is to be found in the tradition of Silsilatuz Zahab. It is related by Imam Ja'far as-Sadiq (a.s.) from Imam Reza (a.s.). It is as follows: 
"Allah says, "The Wilayat of Ali ibne Abi Talib is My fort. Then one who enters My Fort is safe from My wrath (Ghazab)." 
(Oyoon al Akhbaar ar Reza).

There is no doubt that entering the Wilayat of the purified Ahlul Bayt (a.s.) implies taking refuge with the Ahlul Bayt (a.s.), to abstain from all unlawful acts and to remain aloof from their enemies. The word "Tahassum" denotes 'taking refuge in an established fort' and it also suggests that the refuge is not only physical in nature but of a moral form (in spirit) as well. It is therefore imperative to take refuge with these exalted personalities and to follow their superior examples in all aspects of speech and behaviour. In short one who follows them has actually taken refuge in their fort.

Verbal Claim Unaccompanied by Actions is Insufficient

After describing the qualities of the Shias, Imam Muhammad Baqir (a.s.) observed; 
"O Jabir, is it enough for one, to say that 'I love Ali (a.s.) and I have achieved his Wilayat,' whereas he does not act upon it?"

"If someone says, "Surely, I love the Holy Prophet (s.a.w.s.) because he was superior to Ali (a.s.) and I am Shia-e-Muhammad." Inspite of this claim he does not follow the Ahlul Bayt (a.s.) whom the Holy Prophet (s.a.w.s.) had ordered to follow. It is surprising that even after claiming to love the Prophet they do not follow his Purified Progeny (Ahlul Bayt a.s.). Mere claim of love is not sufficient."

Success is Through Actions Alone

The tradition continues, 
"O Jabir, the nearness of Allah is not achieved without His obedience. When our Shias do not have obedience and action (to their credit) we have no authority to free them from Hell. Merely a verbal claim, "I am a Shia" is not sufficient argument for Allah. (If Allah wills he can involve him in punishment; Allah has not promised to bestow salvation upon the claimants of Shiaism- the criteria are obedience and good actions). Then, only one who obeys Allah is our Walee (lover) and the one who is a sinner is our enemy and our Wilayat cannot be achieved but by piety and good deeds." 
(Al-Kafi)

Types of Taqwa According to Allama Majlisi

According to Allama Majlisi (r.a.) there are four types of 'Taqwa'

1. 'Wara-e-Ta'beeri- which means to abstain from the prohibited things.

2. 'Wara-e-Saleheen'- To abstain from doubtful things so that one may not commit a Haraam act. 

3. 'Wara-e-Muttaqeen'- To abstain from permissible things so that one is absolutely protected from 'Haraam'. 

4. 'Wara-e-Sadeqeen'- To avoid everything that is not religious so that one may not waste precious time in useless acts, even though there may not be any risk of committing a sin.

Love

According to traditions, both from the Shia and the Sunni sources, it is established that love protects one from being a slave of one's desires and Shaitan. This is because the love of an exalted personality entails that we also love his friends and hate his enemies. The friendship of Shaitan and the following of one's evil desires are two of the biggest hurdles in one's love for Allah and the Ahlul Bayt (a.s.).

Insha Allah the followers of Ali (a.s.), by the blessing of his love will remain away from the path of Shaitan. Thus, love (for Ahlul Bayt) protects one from evil rather than make him susceptible to sins. In order to explain this idea a few traditions are mentioned below:

Love Makes a Man Steadfast

Imam Muhammad Baqir (a.s.) has said, 
"Whoever has been bestowed the love of Ali (a.s.) in his heart by Allah, is not prone to wavering (from his path) but he becomes steadfast on the path of Allah) and also towards other (matters)." 
(Behaarul Anwaar)

The Testimony of Jabir Ibne Abdullah Ansari (r.a.)

Hazrat Jabir ibne Abdulla Ansari (r.a.) says: If the first step of the lovers of Ahlul Bayt (a.s.) is in the wrong direction due to excess sins the next step is guided aright by (the grace of) their love. 
(Safinatul Behaar)

The Angels Seek Forgiveness for the Partisans of Ali (a.s.)

According to the traditions of the Ahlul Bayt (a.s.), it is an established fact that even the angels ask forgiveness (on behalf) of the followers of Ali (a.s.). A tradition is quoted in Behaarul Anwaar from the Sunni sources in this regard. Anas relates from the Holy Prophet (s.a.w.s.) that he said, 
"Allah has created seventy thousand angels from the light of Ali ibne Abi Talib's face. These angels will (continue to) ask forgiveness (on his behalf and on the behalf of his devotees) till the Day of Judgement."

Devotion for Ali (a.s.) Consumes Our Sins

The love and devotion for Hazrat Ali (a.s.) destroys one's sins as is proved by the numerous reports. Behaarul Anwaar has the following tradition related from the Holy Prophet (s.a.w.s.) by Ibne Abbas (r.a.): 
"Love of Ali (a.s.) consumes the sins like fire consumes wood."

There is a Persian 'Qata' (four-line poem) which summarises this discussion as follows: 
The love of Ali (a.s.) removes the darkness of the heart like the moon and the stars illuminate the night. Salvation will be based on ones love for him and not ones worship deeds.

But those who are his devotees, must also rely upon the Merciful (God). We should not be satisfied only with this devotion and forget Allah.

Difficulties and Calamities Nullify the Sins

The Almighty Allah imposes difficulties and sends calamities to the sinful people among the followers of Ahlul Bayt (a.s.) This is because He wishes to cleanse them of their sins so that they are not liable to any punishment after death. If the sins are more, then he gets a difficult death and if the sins are still in excess then he is punished in Barzakh (grave) upto the Day of Judgement.

It is also stated in the traditions that if there is a sinner whose sins are so much that even after all the punishment they are not expiated; then that person will be interned in the Hell-fire till he has recompensed for the remaining sins. The devotee of Ahlul Bayt (a.s.) shall not remain in the fire forever. The everlasting punishment is only for the unbelievers and the enemies of Ahlul Bayt (a.s.)

The Rewards are Proportionate to the Intensity of Love

Another point to be remembered is that, the intensity of one's devotion is the means for the early forgiveness of ones sins. If love is more, the intercession is swift. Even the painful moments of death are converted into comfort by the help of Ahlul Bayt (a.s.). There was a poet by the name of Sayyid Himyari who died in 173 A.H. He was an ardent devotee of Hazrat Ali (a.s.) and has composed a Qasida (panegyric) on each and every quality of this exalted personality. Whenever there was a Majlis (gathering) in the honour of Ahle Bayt (a.s.) he always insisted upon reciting one of his poems. Various books of the Shias and Sunnis, like Al-Ghadeer (vol.3), Kitab Aghani, Manaqib Sarwari, Kashful Ghumma, Amaali of Shaikh Sadooq, Basharatul Mustafa and Rijaal Kashi mention about him. The following is the gist of the miraculous happenings at the time of his death.

Sayyid was very handsome and fair. At the time of his death he was surrounded by people. Among them were also those who were opposed to the Shias. The condition of the Sayyid deteriorated and all of a sudden a black spot appeared on his face. The stain spread on his face and his complete face turned charcoal black. The opponents were pleased to see his discomfort. The pain caused the Sayyid to lose his consciousness. When he regained his senses he turned towards Najaf-e-Ashraf and pleaded: "O Amirul Momineen Ali (a.s.). O the centre of the hope for helpless people. Do you deal with your devotees in this way?" He repeated this phrase twice more. No sooner did he complete his entreaty that a spot of whiteness became visible on his face. It spread upon his face and soon his face became radiant once again like a full moon. Sayyid was filled with joy, and recited the following couplets extemporaneously.

"They lied who said Ali (a.s.) could not save his followers from difficulties. I swear upon my Creator that I have entered Paradise with my sins all forgiven. I give this good news to those who are devoted to Ali (a.s.) till death. And after him revere his eleven descendants who are the Imams."

After reciting these couplets he confessed to the Oneness of Allah and the Prophethood of the Holy Prophet (s.a.w.s.) and the Wilayat of Amirul Momineen (a.s.). Then he closed his eyes and departed from this world.

Evil Desires are a Barrier to Devotion

Sometimes the desire of this world and its material comforts can cause the love of Ahlul Bayt (a.s.) in ones heart to decrease. An excess of such desires may even make the heart bereft of the love of Ahlul Bayt (a.s.). Such a person when he approacheshis last moments will obviously not get any help from the material he had cherished in his life but he will be so unfortunate as to forfeit the intervention of Ahlul Bayt (a.s.) to save him from a painful death. Several traditions to this effect are present in the books. It would be too lengthy to relate these here, as also it would be straying from our point. Only a casual mention of some traditions would suffice for our purpose.

A Persian Saying

There is a saying in Persian which means that, "Those who believe should try to develop as much as possible the love for the Ahlul Bayt (a.s.) in their hearts." It could be further explained that one should also remove all other objects of desire from the heart and especially refrain from the Greater Sins so that (InshaAllah) they are safe from a dreadful death and the horrors of the Hereafter.

Do Not Use the Bounties for Committing Sins

Imam Ja'far as-Sadiq (a.s.) wrote a letter to certain friends of his: 
If you wish that your life and the hereafter be accomplished with the best of the deeds and that your soul be captured (death occurs) in this condition, then acknowledge the supremacy of Allah. Do not misuse the bounties and gifts granted to you by Allah in committing acts that are forbidden by Him and become disobedient to Him. Respect all those who remember us, Ahle Bayt (a.s.), and claim to love us. It is immaterial (for you) whether he is truthful or not. For you will be rewarded according to your intention and they (the liars) will be punished for their sins. 
(Behaarul Anwaar)

The Gloom of Sins and the Glow of Repentance

Imam Ja'far as-Sadiq (a.s.) was explaining the following verse of the Holy Qur'an: 
"Allah is the guardian of those who believe. He brings them out of the darkness into the light." 
(Surah Baqarah 2:257)

He said, 
"It means Allah takes them away from the darkness of the sins to the light of repentance. Because they were having 'Wilayat' of all the just Imams (all twelve of whom are appointed by Allah). The next portion of the same verse is, "and (as to) those who disbelieve, their guardians are Shaitans who take them out of the light into the darkness."

The Imam further explained, 
"It only means those who followed the light of Islam initially but later started following each an every usurper (leader) not authorised by Allah. They left the light of Islam and entered into the darkness of disbelief (Kufr). Thus Allah ordained upon the disbelievers the fire of Hell.