Worrying about the past or the future isn't productive. When you start chastising yourself for past mistakes, or seeing disaster around every corner, stop and take a breath and ask yourself what you can do right now to succeed.

It's way easier to stay in the comfort zone, especially when things are going good than to go out on a limb and take some risks. My philosophy is exactly the opposite: Sometimes it's risky not to take a risk.

The life of a startup is full of ups and downs, an emotional roller coaster ride that you can't quite imagine if you've spent your whole career in a corporation.

Don't water your weeds.

Ethical decisions ensure that everyone's best interests are protected. When in doubt, don't.

Mackay's Moral: If you are persistent, you will get it. If you are consistent, you will keep it.

No one ever went broke by saying no too often.