The soul is something which contains the body. The body doesn't contain the soul. The soul, if we put it into modern language, is the entire complex of relationships in whose context this organism exists.
The Bhagavad-Gita calls on humanity to dedicate body, mind and soul to pure duty and not to become mental voluptuaries at the mercy of random desires and undisciplined impulses.
Some say that gleams of a remoter world Visit the soul in sleep that death is slumber, And that its shapes the busy thoughts outnumber Of those who wake and live.
As a rule, the mind, residing in a body that has become weakened by pampering, is also weak, and where there is no strength of mind there can be no strength of soul.
The observer of the soul cannot penetrate into the soul, but there doubtless is a margin where he comes into contact with it. Recognition of this contact is the fact that even the soul does not know of itself. Hence it must remain unknown. That would be sad only if there were anything apart from the soul, but there is nothing else.
My liege, and madam, to expostulate What majesty should be, what duty is, Why day is day, night night, and time is time, Were nothing but to waste night, day and time. Therefore, since brevity is the soul of wit, And tediousness the limbs and outward flourishes, I will be brief.