In Ezekiel 27:12, together silver, iron, tin, and lead from Tarshish represent different levels of truth in their proper order, right down to the most external kind of truth, which is truth as we receive it through our physical senses. (Arcana Coelestia 2967[3]) This also signifies a truth in the sense of the letter of the Word, and in the natural man. (Apocalypse Explained 540[6])

'Tin,' as in Ezekiel 22:18, relates to the literal sense of the Word, or the goods and truths of the natural self.

(References: Apocalypse Explained 540)

The nature of the soul is a deep and complicated topic, but it can be summarized as our spiritual life — that is, who we are in terms of our thoughts and affections. And that, generally, is the internal sense when the Bible talks of a soul. You could be missing limbs, disfigured in the body due to illness or accident, paralyzed, but you would still be a complete human being. That's because the soul is the real you, and the soul has to do with internal things, not the state of your body.