He who is sorrowful for this world is in fact displeased with the dispensation of Allah. He who complains of a calamity that befalls him complains of his Lord (Allah). He who approaches a rich man and bends before him on account of his riches then two-third of his religion is gone. If a man reads the Qur'an and on dying goes to Hell then it means that he was among those who treated Divine verses with mockery. If a man's heart gets attached to the world, then it catches three things, namely worry that never leaves him, greed that does not abandon him and desire which he never fulfils.
— ALI IBN ABI TALIB