What was it like working with John Carmack on Quake? Like being strapped onto a rocket during takeoff – in the middle of a hurricane.

It's not the ideas; it's design, implementation and hard work that make the difference.

After you finish the first 90% of a project, you have to finish the other 90%.

I now fully expect to spend the rest of my career pushing VR as far ahead as I can.

Fall for me, as an apple falls, as rain falls, because you must. Use gravity to anchor your desire.

It was a time when only the dead smiled, happy in their peace.

You can choose to be a drag and a burden, or an inspiration and encouragement.

I didn't start the business to make a pile of money. I did it to preserve myself for old age.

Moral sensibilities are nowadays at such cross-purposes that to one man a morality is proved by its utility, while to another its utility refutes it.

When we are out of sympathy with the young, then I think our work in this world is over

Nothing is really so very frightening when everything is so very dangerous

The study of history, it seems to me, leads to the conviction that all important events tend toward the same end - the civilization of mankind.

Passive resistance is a method of securing rights by personal suffering; it is the reverse of resistance by arms.

There is something in omens.