That part of man supplies him life...
That part of man supplies him life, viability, or let us say, this part is the life itself since it is derived from Allah (SWT) who is the Permanent and Alive one, the origin of life and its Creator and Provider and He (SWT) is the Eternal Living one. The more this component grows and flourishes in man, the more purified his self becomes and his heart softens, and his conscious becomes clear, and there is increase in his affection, kindness, emotions, and wisdom, and the more well-behaved he his.
In summary, we can say that his humanity is raised above all other creatures. Being that this component of man is divine and luminary, it is a tie that connects him with his God and creator. So, if this spiritual component in man grew, it is logical that this person will naturally be attracted to his creator under the effect of this tie.
So, man's tendency to exhibit a kind heart, good manners, clear conscious whose luminary and divine part has grown and developed towards his Lord and creator and the source of his light, is then natural, logical, expected, and understood! As for the second component from which man has been created, it is made from the earthly, materialistic, and dusty clay.
It is the part which Allah (SWT) refers to in the Qur’an, "So when I have made him complete [15:29] .” And also the verse saying, “Surely I am going to create a man from clay [38:71] .” This part was created first before the blow of life as the holy verse depicts, "There surely came over man a period of time when he was a thing not worth mentioning [76:1] .” One of the interpretations of this verse is that it refers to that period of time which came after the creation of man from dust and clay, and before the blow of life from Allah (SWT).
During that period of time, man, represented in Prophet Adam (AS) was just a dead and lifeless body and was nothing compared to the world of the living. This earthly and dusty materialistic component in man is the tie which connects man all the time with earth and everything on it. So, it always pulls him down to earth and the life of this world and its elements and everything created from it.
This component of man is the one responsible and the reason behind his lower desires, (eating, drinking, shelter, clothing, mating, entertainment, etc) and the love of money since money is the tool by which you fulfill all these lower desires.