Pay attention to opportunity cost at all times. Doing one thing means not doing other things. This is a form of risk that is very easy to ignore, to your detriment. -- Marc Andreessen (http://blog.pmarca.com/)

Measure everything you can about the product, and you'll start seeing patterns. -- Max Levchin, PayPal founder, Talk at StartupSchool2007

Humans aren't rational -- they rationalize. And I don't just mean "some of them" or "other people". I'm talking about everyone. We have a "logic engine" in our brains, but for the most part, it's not the one in the driver's seat -- instead it operates after the fact, generating rationalizations and excuses for our behavior. -- Paul Buchheit

So the mere constraint of staying in regular contact with us will push you to make things happen, because otherwise you'll be embarrassed to tell us that you haven't done anything new since the last time we talked. -- Paul Graham (a talk at Y Combinator, for startup creators).

Sometimes a man with too broad a perspective reveals himself as having no real perspective at all. A man who tries too hard to see every side may be a man who is trying to avoid choosing any side. A man who tries too hard to seek a deeper truth may be trying to hide from the truth he already knows. That is not a sign of intellectual sophistication and "great thinking". It is a demonstration of moral degeneracy and cowardice. -- Steven Den Beste

What I didn't understand was that the value of some new acquisition wasn't the difference between its retail price and what I paid for it. It was the value I derived from it. Stuff is an extremely illiquid asset. Unless you have some plan for selling that valuable thing you got so cheaply, what difference does it make what it's "worth?" The only way you're ever going to extract any value from it is to use it. And if you don't have any immediate use for it, you probably never will. -- Paul Graham

The only person you are destined to become is the person you decide to be. –Ralph Waldo Emerson

The number one reason people fail in life is because they listen to their friends, family, and neighbors. ~Napoleon Hill

We must believe that we are gifted for something, and that this thing, at whatever cost, must be attained. –Marie Curie

Success is liking yourself, liking what you do, and liking how you do it. ~Maya Angelou