My vision is for a fully reusable rocket transport system between Earth and Mars that is able to re-fuel on Mars - this is very important - so you don't have to carry the return fuel when you go there.

Space travel is the only technology that is more dangerous and more expensive now than it was in its first year. Fifty years after Yuri Gagarin, the space shuttle ended up being more dangerous and more expensive to fly than those first throwaway rockets, even though large portions of it were reusable. It's absurd.

Reusable rockets promise much easier testing because you should usually get them back, and you can debug as you go rather than having to get everything perfect the first time.

It is inexcusable for scientists to torture animals; let them make their experiments on journalists and politicians.

I have an obligation to use what I know to try to bring real, usable medical science to every doctor and bedside and patient.

The revolutionary breakthrough will come with rockets that are fully and rapidly reusable. We will never conquer Mars unless we do that. It'll be too expensive. The American colonies would never have been pioneered if the ships that crossed the ocean hadn't been reusable.

God is looking for people to use, and if you can get usable, he will wear you out. The most dangerous prayer you can pray is this: 'Use me.'

A mistake is always forgivable, rarely excusable and always unacceptable.

We live in a world bathed in 5,000 times more energy than we consume as a species in the year, in the form of solar energy. It's just not in usable form yet.

Design, in its broadest sense, is the enabler of the digital era - it's a process that creates order out of chaos, that renders technology usable to business. Design means being good, not just looking good.

Aspire to expire for a cause uncausable.

Allowing ourselves to let go of the trauma we had to experience does not make the incident irrelevant. What we were put through is inexcusable Letting go means we won't allow it to hold us hostage any longer.

Society tells us that failure should be avoided at all costs, and mistakes are inexcusable. Society's definition of mistakes and failure is infinitely misguided.

Wisdom is not having God's perspective of the whole matter before us, but having God's perspective about what next response will honor Him while keeping us still usable to Him.

To be a Christian means to forgive the inexcusable because God has forgiven the inexcusable in you.

Sometimes your medicine bottle has on it 'Shake well before using.' That is what God has to do with some of His people. He has to shake them well before they are ever usable.

God is looking for people to use and if you can get usable he will wear you out. The most dangerous prayer you can pray is this: 'Use me.'

A mistake is always forgivable rarely excusable and always unacceptable.

A twenty-one-year-old writer is likely to be inhibited by a lack of usable experience. Childhood and adolescence were something I knew.

Design in its broadest sense is the enabler of the digital era - it's a process that creates order out of chaos that renders technology usable to business. Design means being good not just looking good.