Dot the i's, cross the t's, answer the phones promptly, send out errorless invoices, and in general never forget that the devil is in the details.

My real bottom-line hypothesis is that nobody has a sweet clue what they’re doing. Therefore you better be trying stuff at an insanely rapid pace. You want to be screwing around with nearly everything. Relentless experimentation was probably important in the 1970s-now it’s do or die.

The populations of most cities around the world continue to grow. The reasonspeople congregate in cities are various and complex, and the dawn of the digital age has not put much of adamper on the human urge to congregate.

Reward excellent failures. Punish mediocre successes.

Develop a respect and reverence for the principle of variation: the idea that the message ain't in the mean, the mode or the median - it's in the differences that occur throughout a population.

One size NEVER fits all. One size fits one. Period

I think it's wonderful to save the world, but you need to be part of the world, too.