Do Not Grieve Over That Which Has Passed You by in Life, for Indeed You Have Been Blessed With Much.
Contemplate the many favors and gifts that Allah has bestowed upon you and be thankful to Him for them. Remind yourself of Allah’s many blessings, for He, the Almighty, said:
And if you would count the graces of Allah, never could you be able to count them.
And [Allah] has completed and perfected His Graces upon you,[both] apparent [i.e. Islamic Monotheism, and the lawful pleasures of this world, including health, good looks, etc.] and hidden [i.e. Ones Faith in Allah (of Islamic Monotheism) knowledge, wisdom,guidance for doing righteous deeds, and also the pleasures and delights of the Hereafter in Paradise, etc.].
And whatever of blessings and good things you have, it is from Allah. Then, when harm touches you, unto Him you cry aloud for help.
Allah says, establishing His favors upon man:
Have We not made for him a pair of eyes; and a tongue and a pair of lips? And shown him the two ways [good and evil]?
Life, health, the faculties of hearing and seeing, two hands and two legs, water, air, food – these are some of the more visible blessings in this world, while the greatest of all blessings is that of Islam and correct guidance. What would you say to someone who offered you large sums of money in return for your eyes, your ears,your legs, your hands, or your heart? How great is your wealth in reality? By not being thankful, you do not render justice to Allah’s countless favors.