The enlightened ones and those who according to the Quran show insight and have made spiritual journeys mention three degrees of piety.
I - Outstanding Piety
II - Especial Piety
III - Ordinary Piety
In a very notable tradition Imam Sadiq (Pbuh) explained these three degrees in the following manner:
I - Outstanding Piety
The first degree of piety is being completely absorbed by Allah and consists of the individual abstaining from religiously lawful things and actions, much more the religiously doubtful things and actions.
II - Especial Piety (In Awe of Allah)
The second degree of piety is "In Awe of Allah" meaning the individual abstains from all religiously doubtful things and actions, much more the prohibited ones.
III - Ordinary Piety
The third degree of piety results from fear of Hell's punishment and God's painful Wrath. This degree consists of abstaining from all sins and forbidden things and actions. [Mava'ez al-’Addadiyi, p.180]
Of course, the meaning of abstaining from religiously lawful things and actions expressed in Imam Sadiq's statement has the following meaning: those having this type of piety do not pursue many of the religiously lawful affairs since they feel they do not require them. And concerning the lawful necessities they require for subsistence, they observe the utmost frugality.
The power to be contented is practicable for everyone, and if anyone denies it, the excuse will not be accepted. Being contented with what is religiously lawful and limiting the materialistic affairs of life are moral actions and approved of programs providing the environment for the realization of angelic piety in all affairs.
source : THE LAND OF THE LOVERS An Exposition on Imam Zainol Abedin’s Sahifeh Sajjadieh VOLUME 1 BY Shaykh Husayn Ansariyan Translated by Dr. M. Farrokhpey