Shaykh al-Uthaymeen (rahimahullah):
Whenever (you find) your heart heedless, and you are preoccupied with the worldly life, then go to the graves and contemplate about those people (in the graves), yesterday they were upon the earth, just as you are now.
Sharh Riyadh as-Saaliheen v.3 pg.473
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Shaikh Ibn Uthaymeen said:
Sickness of the heart; (and protection is sought from Allah) it brings about corruption in one’s worldly life and after life. If the heart becomes sick with doubt, polytheism, hypocrisy or a dislike for what Allah has revealed, or hatred towards Allah’s allies, or with anything that is similar to that, then indeed (as a result of that) his worldly life and after life will end up in ruin. Therefore, it is binding upon you whenever you ask for well-being to bring to mind that you’re asking (for both) well-being against illness of the heart as well as illness of the body.
Sharh Ar-Riyaadhus Saaliheen Volume 6 Page 21
Translated by Abu Arwa Ali bin Mushtaq Mir