Failing doesn't have to mean not succeeding. It can be, 'Hey we tried that. We can go forward, smarter.'

One who fails has not failed absolutely, rather they have learned absolutely

If you don't have a tonne of optimism, you're not going to make it... you won't be able to evangelise to everyone else. On the other hand, if you aren't constantly paranoid about what can go wrong and put plans in place, then you're going to get bitten at some point.

Perseverance is failing 19 times and succeeding the 20th.

When you try to do something ten per cent better, you tend to work from where you are: if I ask you to make a car that goes 50 miles a gallon, you can just retool the engine you already have.

Glass is the world's worst spy camera. If you want to surreptitiously take photos, I would not use Glass.