"While they [non-tantric philosophers] were alive they cast abuse at the
tantras and could not accomodate them in their minds; they did not know
the tantric deities, therefore they could not recognize them in the bardo
either. Suddenly seeing something they have never seen before, they think
of it as an enemy and feel aggression toward it, and as a result they go
to the lower realms."
Tibetan Book of the Dead