The Prophet Muhammad (peace be upon him) said: "Be kind, for whenever kindness becomes part of something, it beautifies it. Whenever it is taken from something, it leaves it tarnished." He also said: "Make things simple and do not complicat...e them. Calm people and do not drive them away." - Imam Bukhari's Book of Muslim Morals and Manners
"...if anyone killed a person not in retaliation of murder, or (and) to spread mischief in the land - it would be as if he killed all mankind, and if anyone saved a life, it would be as if he saved the life of all mankind". (Surah 5 : Verse 32)