When I need inspiration I go read "How to Make Wealth"[1].
During my day job where I'm required to study specifications, I found "The Feynman Technique"[2] to be useful in understanding the subject quickly.
From time to time I also read "The Best of edw519: A Hacker News Top Contributor"[3].
I just repeatedly read articles and posts that I like:
[0] - http://paulgraham.com/procrastination.html
[1] - http://paulgraham.com/wealth.html
[2] - http://calnewport.com/blog/2012/10/26/mastering-linear-algeb...
[3] - https://web.archive.org/web/20160304034949/http://v25media.s...