Each of your breaths is a priceless jewel, since each of them is irreplaceable and, once gone, can never be retrieved. Do not be like the deceived fools who are joyous because each day their wealth increases while their life shortens. What good is an increase in wealth when life grows ever shorter? Therefore be joyous only for an increase in knowledge or in good works, for they are your two companions who will accompany you in your grave when your family, wealth, children and friends stay behind.

-Imam Ghazali