To get that true knowledge of 'I' one must understand that life is different and body is different. The basic understanding that there is life in body means that the presence of vitality in the body. For that vitality, there has to be something that has vitality of its own. That something is soul.

Hence life must be seen differently from its packing which is nothing but the physical body.
Life is ecapsulation, soul is the object, ways of thinking are the peocesses.
Hence all souls will have the same goal - 'Get happiness'. Through the mind processor.
Thus the knowledge of soul is important to seek what everyone is looking for 'The Happiness', 'The Peace', 'The Thrill', 'The excitement', 'The bliss', 'The satisfaction' ....Name it whatever you name that good feeling sought by all without any exception.