Stubbornness destroys good advice.

Many a spoken word is more piercing than an attack.

The best deed of a great man is to forgive and forget.

Be afraid of a dignified man when he is hungry and a wicked man when his belly is full.

Be a good man to Allah and a bad man to yourself (desires); and be one of the commoners among the people

Fear the sins that you commit in secret, because the Witness of those sins is the Judge Himself!

If you find that somebody is not grateful for all that you have done for him, then do not get disappointed because often you will find that someone else feels under your obligation though you have done nothing for him and thus your good deeds will be compensated, and Allah will reward you for your goodness.