"And having driven out the man, He stationed at the east of the Garden of Eden the Cherubim and the flame of the ever-turning sword, to guard the way of the Tree of Life"
This is the first time in the Torah that the term 'Cherubim' is mentioned. Here they mean destructive angels, whose job is to prevent man from re-entering the garden.
However, when mentioned later in the Torah, the definition of the same term switches to sacred, angel-like children.
Rav Yaakov Kamenetsky makes an interesting analysis based on the above, "Here they are destructive, and there they represent the life-giving powers of the Torah. This alludes to the paramount importance of education. Children can become holy or destructive, depending on how they are reared."
An interesting piece in the Jerusalem Post about Isabelle Fhima