Favorite recent books:
"Choose who you would be, then do what you must" -- Unknown
Why it rings true for me: Those ten words kind of some it all up, don't they? Plus, it can even be said in iambic pentameter if you choose.
"The real hell of life is that everyone has his reasons." -- Jean Renoir
Why it rings true for me: It's one of those lessons I'm reminded of from time to time; everyone has their reasons -- be them evident to you or not.
"You can't plow a field by turning it over in your mind." -- Unknown
Why it rings true for me: This resonates with me particularly in the context of starting a new business. You can wring your hands all you want over coming up with a great plan on paper, but it comes down to the doing in the end.