Let it be known to you that tadhakkur (remembrance) is the result of tafakkur (contemplation). Hence the station of tafakkur has been considered to precede that of tadhakkur. Khwajah `Abd Allah al-'Ansari says:
Tadhakkur stands above tafakkur, for verily tafakkur is the search (of the Beloved) and tadhakkur is the attainment (of the Beloved).
As long as man is on the path of search, he is separate from the searched object. With the finding of the searched beloved, he is relieved of the labour of search. The strength and the perfection of tadhakkur is dependent on the strength and perfection of tafakkur. The tafakkur whose result is complete tadhakkur of the Worshipped One does not compare with other actions in regard to merit. Accordingly, in the noble traditions, an hour of tafakkur is considered to be better than the `ibadah (worship) of a year, or even that of sixty or seventy years. It is obvious that the ultimate goal and fruit of the `ibadat is the attainment of the knowledge and remembrance of God, and this is better attainable through valid contemplation. Perhaps, an hour's contemplation may open to the wayfarer the door to mystic knowledge, which may not be opened even by seventy years of`ibadah, or it may make a human being so mindful of the Beloved that not even the austerities of several years can be able to achieve such a result.
And my dear, let it be known to you, the remembrance of the Beloved and keeping the heart engaged in the memory of the Adored One have many results for all the classes of people. As to the perfect ones, the awliya' and the `urafa', it is the ultimate goal of their hopes, under whose shadow they receive communion with the Beloved's splendour - may it do them much good! As to the ordinary people and the mutawassitun, it is the noblest of the formative agents of morality and conduct, in outward as well as inward life.
If man remain in the remembrance of God Almighty in all conditions and states, and see himself as present in the court of that Sacred Essence, he would of course refrain from the matters which are contrary to His good pleasure, and check the self from rebelliousness. All the calamities and afflictions brought about by the carnal self and the accursed Satan are due to forgetting God and His chastisement. The forgetting of God increases the darkness of the heart and allows the carnal self and Satan to dominate the human being, thus multiplying his afflictions day by day. The remembrance of God gives polish and burnish to the heart and makes it a reflector of the Beloved's beauty. It purifies the soul and liberates the self of the human being from bondages. The love of the world, which is the source of all error and the fountainhead of all sin, is purged from the heart. All the anxieties and concerns are replaced by the sole concern of purifying the dwelling of the heart for the sake of the entry of the Dweller.
Therefore, my dear, whatever pains and hardships that you bear in. the path of the dhikr and remembrance of the Beloved are little. Accustom your heart to the remembrance of the Beloved, so that, God willing, the heart itself takes on the form of dhikr, so that the immaculate pronouncement la ilaha illa Allah becomes the ultimate form and the furthest limit of perfection of the self. There is no better provision for the wayfarer in his journey toward God, no better reformer for the defects of the soul, and no better guide to the Divine teachings.
Hence, if you are a seeker of the formal and spiritual excellences, if you are a wayfarer of the Hereafter's path, a traveller and emigrant towards Allah, habituate the heart to the Beloved's dhikr and knead it with the remembrance of God.
source : Forty Hadith by Imam Ruhullah al-Musawi al-Khumayni