If you're building a social product, you're still living in the last century if your product doesn't work on Facebook.

The single most important top-level trend is the shift to mobile.

Ignore your mistakes. The number one thing to worry about is -Am I doing what I'm good at?

You can have successful teams where people hate but deeply respect each other; the opposite (love but not respect among team members) is a recipe for disaster.

Having a highly homogeneous background, education, values, preferences, etc, in the very early team is better than not - cuts down on time-wasting arguments.

The world is now awash in data and we can see consumers in a lot clearer ways.

We're all put on Earth for a limited amount of time. Am I using in a way that is great, or good enough, or wasteful?

The notion that diversity in an early team is important or good is completely wrong. You should try to make the early team as non-diverse as possible.

Being an entrepreneur is not about being in love with an idea, it's about being in love with running a company.

You can't get married to any one particular plan. That is the biggest lesson I learned at PayPal.

Facebook is so ubiquitous now that it's like another manifestation of the web itself.

Almost everything that distinguishes the modern world from earlier centuries is attibutable to science, which achieved its most spectacular triumphs in the seventeenth century.

Nevertheless, life and death are mysterious states, and we know little of the resources of either.

If a man treats you like a princess, he deserves to be your king.

When I pass, speak freely of my shortcomings and my flaws. Learn from them, for I'll have no ego to injure.

...History it seemed could be something entirely different a splash of blood whose agony didn't fade overnight or over centuries.

God makes nothing without order, and everything that forms itself develops imperceptibly out of small parts.

When I pass my name in such large letters I blush, but at the same time instinctively raise my hat.

To do it nationally or internationally, you have to follow a few more rules.

The future comes quickly. Before you know it, you turn around and it's tomorrow.

The curse of modern times is the propensity of male hormones in places where they can do the most damage