1. If something is very important to you, you should stick to it even if everyone is against you.

2. After selling PayPal, I have been thinking: What other problems are most likely to affect the future of mankind? And not just from a “best way to make money” perspective.

3. Only by first seeing the possibility of something will there be a chance of it happening.

4. You can put all your eggs in the same basket, but only if you can control what happens in the basket.

5. Persistence is very important, never give up unless you have to.