"Fear is the innate reaction to everything that has not been rendered predictable, as a consequence of successful, creative exploratory behavior undertaken in its presence, at some time in the past. LeDoux states:

It is well established that emotionally neutral stimuli can acquire the capacity to evoke striking emotional reaction following temporal pairing with an aversive event. Conditioning does not create new emotional responses but instead simply allows new stimuli to serve as triggers capable of activating existing, often hard-wired, species-specific emotional reactions.

Fear is not conditioned; security is unlearned... fear is not secondary, not learned; security is secondary, learned. Everything not explored is tainted, a priori, with apprehension. Any thing or situation that undermines the foundations of the familiar and secure is therefore to be feared." - Jordan Peterson