I like to get my inspiration from really meaningful phrases said by truly great people like вЂњIf you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all thingsвЂќ, do you know where I can find thematic compiltaions of those?
 
http://stevenrgerst.com/s56-gt/04/articles-nydpoVH-29166/page/13