There is no captive in a worse state than the one who is captivated by his worst enemy (Shaytan) and there is no prison which is tighter than the prison of hawa (desire) and there is no bond/fetter more strong than the bond of desire. How, then, will a heart which is captivated, imprisoned and fettered travel unto Allah and the Home of the Hereafter?

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

Patience is that the heart does not feel anger towards that which is destined and that the mouth does not complain.

As you can taste a pot full of food with a spoon likewise someone's tounge can tell you about his heart.

Sitting with the poor and less fortunate people removes the ego and pride from your heart.

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.

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.