What do we know to be important but are unable to measure?

Spend the most time with your best people. ... Talent is the multiplier. THe more energy and attention you invest in it, the greater the yield. The time you spend with your best is, quite simply, your most productive time. ... Persistence directed primarily toward your non-talents is self-destructive. ... You will reprimand yourself, berate yourself, and put yourself through all manner of contortions in an attempt to achieve the impossible.

The opposite of a leader isn't a follower. The opposite of a leader is a pessimist.

Remember, what you focus on expands; results follow focus.

It's a special person - and personality - who can lead a start-up to soaring success and sustain that success for the long term. Apple co-founder Steve Jobs and Facebook's Mark Zuckerberg are star examples.

Always work hard. Intensity clarifies. It creates not only momentum, but also the pressure you need to feel either friction, or fulfillment.

A note of caution: We can never achieve goals that envy sets for us. Looking at your friends and wishing you had what they had is a waste of precious energy. Because we are all unique, what makes another happy may do the opposite for you. That's why advice is nice but often disappointing when heeded.