By working only when you are most effective, life is both more productive and more enjoyable. It's the perfect example of having your cake and eating it, too.

This is not my phrase, but if you're stuck in the past, then you're depressed. If you're stuck in the future, then you're anxious.

A person's success in life can usually be measured by the number of uncomfortable conversations he or she is willing to have.

Focus on impact, not approval. If you believe you can change the world, which I hope you do, do what you believe is right and expect resistance and expect attackers. Keep calm and carry on!

An entrepreneur isn't someone who owns a business, it's someone who makes things happen.

Effectiveness is doing the things that get you closer to your goals. Efficiency is performing a given task (whether important or not) in the most economical manner possible. Being efficient without regard to effectiveness is the default mode of the universe.

Creating demand is hard. Filling demand is easier. Don't create a product, then seek someone to sell it to. Find a market - define your customers - then find or develop a product for them.