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: