Why the soul is so difficult to understand

If the soul is within, the body, head, hands and legs grow, but otherwise they do not. A dead child does not grow up, for the soul is not present. If by a careful analysis of the body one still cannot find the existence of the soul, this is due to his ignorance. How can a gross man fully engaged in materialistic activities understand the soul, which is a small particle of spirit one ten-thousandth the size of the tip of a hair? Such a person foolishly thinks that the material body has grown from a combination of chemicals, although he cannot find them.

Srimad Bhagavatam 7.7.24 purport