A dying child was once placed in the lap of the Prophet Muhammad (peace be upon him). Tears flowed from the Prophet's eyes. When he was questioned about crying for the child, the Prophet said: "(Tears are a form of) mercy that God has lodged in the hearts of His servants, and God is merciful only to those of His servants who are merciful (to others)." 

[Bukhari, Volume 2, Hadith 373]

"Fear your sins more than you fear the enemy as your sins are more dangerous to you than your enemy" [Umar ibn Khattab - May ALLAH be pleased with him]

You don't realize how strong a person really is until you see them at their weakest moment.

The Prophet (peace be upon him) said: "Riches does not mean, having a great amount of property, but riches is self-contentment."

[Bukhari Book 76 Hadith 45)