“Do not betray the one who betrays you.” 

‎"The heart cannot become purified until a person knows Allah, loves Him, fears Him, has hope in Him and trusts Him. This is the true realization of the statement Laa ilaaha ill-Allah. The heart will never be pure until it loves, deifies (worships, exalts), fears, and submits to no one except Allah, eventually ending up of the limbs by following and making the actions pure."

{Hasan al-Basree rahimahullah}