Board Thread:Warhammer 40k General Discussion/@comment-5846164-20130211074649/@comment-6078851-20130222040650

sorry, i'll try to explain my speculation more clearly.

someone is afraid of something, they don't know why for they see no logical reason to feel fear - for example: monsters in the closet. since the soul is present in the warp then maybe this fear is an echo of fear felt by the soul. the soul shares the same realm as the chaos gods and maybe the soul can sense them and understands the eternal damnation it could be subject to, thus it feels fear, which is then felt by the physical person but they can't explain the basis of this fear.

blanks, having no soul, would never feel this fear.

this is my hypothesis for their fearlessness, i hope it's clearer now :)