Lyric discussion by chikenlegg 

Cover art for Sanity lyrics by Bad Religion

I think he is talking about his attempt to find truth. The more he digs for it, the more he questions it, until he is unsure of what the truth really is. Also I think he his conceives of sanity as having an understanding of the truth, which to him is an idealistic goal that he feels he cannot realistically attain.

Thoughts?