﴿ وَإِذْ تَأَذَّنَ رَبُّكُمْ لَئِن شَكَرْتُمْ لَأَزِيدَنَّكُمْ ۖ وَلَئِن كَفَرْتُمْ إِنَّ عَذَابِى لَشَدِيدٌۭ ﴾

“And [remember the time] when your Sustainer made [this promise] known: 'If you are grateful [to Me], I shall most certainly give you more and more; but if you are ungrateful, verily, My chastisement will be severe indeed!"'”

If you are thankful then assuredly I will give you more�He [Sahl] said:Gratitude (shukr) for knowledge is acting (ʿamal) [on this knowledge]. Gratitude for acting [on this knowledge] increases [one�s] knowledge. This is how it always is, and this is its condition.He also said:Gratitude is that you should acknowledge [that] increase. Otherwise gratitude is flawed. The true realisation of weakness (ḥaqīqat al-ʿajz) is in acknowledging it. It is reported that David, said, �How can I thank You when through my gratitude I receive renewed bounty from You?� God replied, �Now you have shown true gratitude towards me.� His words, Exalted is He: