Passion. The life of an entrepreneur is occasionally exhilarating, and almost always exhausting. Only unbridled passion for the concept is likely to see you through the 17-hour days (month after month) and the painful mistakes that are part and parcel of the start-up process.

Today brands are everything, and all kinds of products and services - from accounting firms to sneaker makers to restaurants - are figuring out how to transcend the narrow boundaries of their categories and become a brand surrounded by a Tommy Hilfiger-like buzz.

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.

Learning is a matter of intensity not elapsed time.

I would not be surprised to see interesting new forms of expression and literary genres develop as the e-book movement matures.

Progress is mostly the product of rogues.

The unthinkable is thinkable. No: likely.