Allah has created everything with a purpose; just like His blessings. Each one of these blessings—our life, faith, sustenance, health, eyes, and ears—is an endowment for mankind to be grateful to Allah.
Once we leave heedlessness and ignorance behind, and start to think and see with reasoning, we shall surely realise that everything around us is indeed a favour granted by our Creator Allah. All the food that we eat, the air that we breath, all the beauties around us, in particulars, our eyes that let us see all these things — everything is a blessing of Allah. These are so numerous that the Qur’an says: “If you would count up the favours of Allah, never would you be able to number them: for Allah is Oft-Forgiving, Most Merciful.” (Surat an-Nahl,16:18)
And, undoubtedly, all these favours are given for some reason. Nothing is created for us simply to use as we wish. On the contrary, the reason for all those favours – no matter what - is to instruct mankind towards Allah; because everything given, necessitates gratitude in return. Allah is the One Who continuously gives all the blessing; we should, therefore, show our sincere gratitude only to Him.
Gratefulness is both a great prayer and also a way to protect us from “transgressing”. Without it, people have a tendency towards depravity and evil, forgetting their weaknesses and becoming haughty, the richer and more powerful they become. Showing our gratitude to Allah saves us from such “depravity”. Those who show their gratefulness to Allah do so in the knowledge that everything they obtain is given by Allah, to Whom they always belong. They know that they are responsible for using these blessings in the way of Allah and only as He wills. It was this gratitude to Allah that underlay the modesty and maturity of the prophets, such as Davud (David) or Suleyman (Solomon) to whom great possessions, states and sovereignty were given. The actual problem of Karun (Qarun), who became depraved on account of his possessions, was indeed that of being ungrateful to Allah.
If a believer demonstrates that he will not become arrogant and impertinent with the blessings or riches he is given, Allah shall give him more. “…If you are grateful, I will add more (favours) unto you; but if you show ingratitude, truly, My punishment is terrible indeed.” (Surah Ibrahim, 14:7)
Gratitude should not be shown merely withwords, it should be shown rather by utilizing each favour in a way approved of by Allah. Believers are responsible for using everything that they have been given, in the way of Allah. First of all, all the believers should start using whatever they possess, and foremost the body Allah has endowed them with, to strive for His cause. The Qur’an also informs us that we may show our gratitude to Allah by proclaiming all of His blessings, that is, by communicating His “message” to all:
“Verily your Guardian-Lord will give you (that wherewith) you shall be well-pleased. Did He not find you an orphan and give you shelter? Did He not find you wandering, and give you guidance? Did He not find you in need, and make you rich? Therefore, treat not the orphan with harshness, nor repulse the petitioner (unheard); and proclaim the bounty of your Lord!” (Surat ad-Dhuha, 93:5-11)
Source: The Moral Values of the Qur’an