Doom comes about because of neglecting to evaluate one's self and because of just following one's whims.

Whoever desires to purify his heart, then let him prefer Allah to his desires

Had Allah lifted the veil for his slave and shown him how He handles his affairs for him, and how Allah is more keen for the benefit of the slave than his own self, his heart would have melted out of the love for Allah and would have been torn to pieces out of thankfulness to Allah. Therefore if the pains of this world tire you, do not grieve. For it may be that Allah wishes to hear your voice by way of Dua'a. So pour out your desires in prostration and forget about it and know; that verily Allah does not forget it.

Satan rejoiced when Adam (peace be upon him) came out of Paradise, but he did not know that when a diver sinks into the sea, he collects pearls and then rises again.

Every gulp of air that goes out in a cause other than the cause of Allah will turn to sorrow and regret on the Day of Judgement.

Wasting time is worse than death, because death separates you from this world whereas wasting time separates you from Allah

We should know that Allah has created us to live an eternal life with no death, a life of pride and ease with no humiliation, a life of security with no fear, a life of richness with no poverty, a life of joy with no pain, a life of perfection with no flaws. Allah is testing us in this world with a life that will end in death, a life of pride that is accompanied by humiliation and degradation, a life that is tainted by fear, where joy and ease are mixed with sorrow and pain.