I like to get my inspiration from really meaningful phrases said by truly great people like “Religion is the sign of the oppressed … it is the opium of the people”, do you know where I can find thematic compiltaions of those?

http://www.leatherbazar.co.uk/2016/02/19/what-s-better-essay-writing-by-yourself-or-15/
http://life-is-light.ru/?p=3028