One who says unpleasant things about others, will himself quickly become a target of their scandal. — Imam Ali. 1st Shia Imam and 4th Rashidun caliph (656–661)
148. One who does not realize his own value is condemned to utter failure. (Every kind of complex, superiority or inferiority is harmful to man).
Unfortunate is he who cannot gain a few sincere friends during his life and more unfortunate is the one who has gained them and then lost them (through his deeds).
The sin which makes you sad and repentant is more liked by Allah than the good deed which turns you arrogant.