Ask HN: What are your sources of inspiration and motivation?

I was wondering what other members of the HN community found as sources of inspiration and motivation. Maybe it's a book, a quotation, a poem, an image, a movie, a project you worked on, etc.

For example, I've always enjoyed this poem by E. Dickinson - a concise recipe for being honest to yourself and persevering.

"Lad of Athens, faithful be To Thyself, And Mystery— All the rest is Perjury—"

http://en.wikisource.org/wiki/Lad_of_Athens,_faithful_be

My hope is that this thread will become full of good sources and discussion.

Thanks!