Arcana Coelestia #285
285. Of the sixth and seventh posterities, in that they were deprived of all memory-knowledge [scientia] of what is good and true, and were left to their own filthy loves and persuasions; this being provided lest they should profane the holy things of faith, which is signified by his being “driven out, and cherubim being made to dwell at the garden, with the flame of a sword, to keep the way of the tree of lives” (verse 24).
Genesis 3:24
24
So he drove out the man; and he placed Cherubs at the east of the garden of Eden, and the flame of a sword which turned every way, to guard the way to the tree of life.