The soul is the cause or source of the living body. The terms cause and source have many senses. But the soul is the cause of its body alike in all three senses which we explicitly recognize. It is (a) the source or origin of movement, it is (b) the end, it is (c) the essence of the whole living body.
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.
This one life has no form and is empty by nature. If you become attached by any form, you should reject it. If you see an ego, a soul, a birth, or a death, reject them all.
Opinion involves belief (for without belief in what we opine we cannot have an opinion), and in the brutes though we often find imagination we never find belief.
Yet much remains To conquer still; peace hath her victories No less renowned then war, new foes arise Threatening to bind our souls with secular chains: Help us to save free conscience from the paw Of hireling wolves whose gospel is their maw.
This melancholy London - I sometimes imagine that the souls of the lost are compelled to walk through its streets perpetually. One feels them passing like a whiff of air.