...it is a painful and dangerous undertaking to thus tunnel into oneself...(UM,129)
You know, I'm curious. Painful, I'd agree, but why is it dangerous to examine who we are? So far, I think its something that everyone should do.

Ah! I found the answer from SAE (140) which gives the two dangers as isolation and despair of the truth.

p.s.Actually, as Wenghong has kindly pointed out, there is more than 2! Will write about this is another post.