Don't forget your own self while preaching to others.
If a person has ten habits out of which nine are good and one bad, that bad one will destroy the good ones.
Avoidance of sin is lighter than the pain of remorse.
May Allah have mercy on him who sends me my faults as a present.
Learn the Arabic language; it will sharpen your wisdom.
Get used to a rough life, for luxury does not last forever.