This takes place in man’s externals, but not in internals.
How the Lord leads and teaches man in his internals no one knows, as no one knows how the soul operates to cause the eye to see, the ear to hear, the tongue and mouth to speak, the heart to move the blood, the lungs to breathe, the stomach to digest, the liver and pancreas to assort, the kidneys to secrete, and countless other things. These things do not come to man’s perception and sensation. The same is true of what is done by the Lord in the interior substances and forms of the mind, which are infinitely more numerous — the Lord’s operations in these are not manifest to man. But the effects, which are numerous, are manifest, as well as some of the causes producing the effects. These are the externals wherein man and the Lord are together. And because externals make one with internals (for they cohere in one series), the Lord can arrange things in internals only in accordance with the disposition that is effected by means of man in the externals.
Every one knows that man thinks, wills, speaks, and acts to all appearance as if from himself; and every one can see that without this appearance man would have no will or understanding, thus no affection or thought, also no reception of any good and truth from the Lord. This being so, it follows that without this appearance there would be no knowledge of God, no charity or faith, and consequently no reformation or regeneration, and therefore no salvation. From all this it is clear that this appearance is given to man by the Lord for the sake of all these uses, and chiefly that man may have the ability to receive and to reciprocate, whereby the Lord may be conjoined with him and he with the Lord, and that through this conjunction man may live forever. This is the appearance here meant.