Selection from Apocalypse Explained ~ Emanuel Swedenborg
Something shall now be said about its [the spiritual mind's] formation. The spiritual mind is formed from those things that are in man's memory from the Word; for the memory is the storehouse ... but these things are elevated therefrom in this manner:First, there is given to man the affection of truth, which is called the spiritual affection of truth, which is that man loves truth because it is truth. This affection of truth is then given because when evils are removed man is in goods from the Lord, and good loves truth and truth good, and the two will to be conjoined. This affection is given by the Lord alone, because the Lord in heaven is Divine truth; and it is given by the Word, because the Lord in the church is the Word.
Secondly, those things that are from the Word in man's storehouse ... are drawn forth and purified by the Lord, and genuine truths are there discriminated and separated from falsities; for man's spiritual mind can be formed only out of genuine truths, since heaven is in no other.
Thirdly, those truths are elevated by the Lord in a wonderful manner, and become spiritual; this is effected by the influx of heaven, and thus of spiritual things corresponding to natural; and these truths are there disposed into a heavenly form.
Fourthly, the truths that are elevated into the spiritual mind are not in a natural but in a spiritual form. Truths in a spiritual form are such as are in the spiritual sense of the Word, but truths in a natural form are such as are in the natural sense of the Word.... For this reason, when man after death becomes a spirit and his spiritual mind is opened, he no longer thinks and speaks naturally, but spiritually.
Fifthly, so long as man is living in the world he is wholly ignorant of what he thinks in the spiritual mind; he knows only what he thinks from that mind in the natural; but after death the state is changed, and he then thinks from the spiritual mind, and not from the natural.
(Apocalypse Explained 790:8)