Ameer al-Momineen (a.s) went up the pulpit and said: “O' people! Put what you learn into practice, per chance you may be guided. A scientist who acts against his knowledge is similar to a wandering ignorant person who will not become conscious due to his ignorance. This scientist will even be more sorry about the knowledge that he has abandoned than the ignorant person who is wandering in his ignorance. Both are wandering asleep. Both are lost without any goals. Both are at a loss. Do not let any doubt overcome you. Do not doubt (about God) so that you do not become an infidel. Do not l et yourselves b e fooled ab out the truth, since then you will be losers. Part of the truth is to understand religion. If you understand, you will not be haughty. The one who is most concerned about himself is the one who best obeys God. The one who is most treacherous to himself is the one who disobeys God the most. Whoever obeys God is secure, and will be rewarded, but whoever disobeys God will be sorry.”