Truly in the heart there is a void that can not be removed except with the company of Allah. And in it there is a sadness that can not be removed except with the happiness of knowing Allah and being true to Him. And in it there is an emptiness that can not be filled except with love for Him and by turning to Him and always remembering Him. And if a person were given all of the world and what is in it, it would not fill this emptiness.

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

A tear that runs down a believer's cheek is more beneficial than a thousand raindrops on the earth

The perfection of Tawheed is found when there remains nothing in the heart except Allaah

From the perfection of Allah's ihsan is that He allows His slave to taste the bitterness of the break before the sweetness of the mend. So He does not break his believing slave, except to mend him. And He does not withhold from him, except to give him. And He does not test him (with hardship), except to cure him.

A person’s tongue can give you the taste of his heart.

Happiness is attained by three things: being patient when tested, being thankful when receiving a blessing, and being repentant upon sinning.