In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Imaam As-Sadi [rahimahullaah] said:
How many a person knows about love of Allaah, its rulings and all the affairs it necessitates, but his heart is deprived of it?! And how many a slave knows and bears witness to the pre-decree of Allaah and the excellence of sufficing oneself with Him, but when that which has been decreed takes place in opposition to what he desires, you see him anxious-having no tranquility and certainty, nor repose?! And only the one whose heart has acquired knowledge and awareness of Allaah in truth is at ease with the fact that Allaah is sufficient for him, whilst submitting to His judgements regardless what the state of affairs may turn out to be. And how many a person knows the rulings of trade and its details, but at the time of dealing, buying and selling, he does not deal in a beautiful manner with others?! So, do not be deceived when you know something that you will be attributed to it. This is why it is obligated on a person to ask Allaah for beneficial knowledge- knowledge that produces [righteous] deeds. And Allaah knows best.
Majmoo Al-Fawaa’id Waqtinaas Al-Awaabid. Faa’idah Number 14