It is the good fortune of man that he acknowledges the favours of Allah Ta‘ala. Whatever we have is from Allah Ta‘ala as He alone is the Controller and the Conferrer. But the moment a person begins to feel that he has acquired whatever he has on account of his own doing and attaches his absolute ownership to everything that he has, it is the stepping stone to his peril.
Imagine for a moment, a person lends his brand-new Porsche to his friend for a month or two. However, the friend connives and tries to forge the log book and transfer the car on to his name. How upset and distraught will he feel!
Similar is the case with the favours of Allah Ta‘ala. When man begins to claim complete ownership over them on account of his actions and forgets Allah Ta‘ala, then this is the worst of crimes he could ever commit.