Learning research tells us that the time lag from experiment to feedback is critical.

I'm not a great programmer; I'm just a good programmer with great habits.

A plan is an example of what could happen, not a prediction of what will happen.

Optimism is an occupational hazard of programming; feedback is the treatment.

I don't like the feeling, but I've got to say that a little fear makes me a more focused, more responsible programmer.

Testing is not the point. The point is about responsibility.

Listening, Testing, Coding, Designing. That's all there is to software. Anyone who tells you different is selling something.

Make it work, make it right, make it fast.

I've known people who have not mastered their tools who are good programmers, but not a tool master who remained a mediocre programmer.

Sometimes the problem has to mature before the solution can mature.

I tell people to start implementing when they are pretty sure there aren't more important stories out there. An iteration's worth of data is worth months of speculation.

None of our achievement matters, than how we have lived our lives.

There is no way to deter old age from its grim duty, but a life of accomplishments makes up in quality for what it cannot add in quantity.

The first footfalls on Mars will mark a historic milestone, an enterprise that requires human tenacity matched with technology to anchor ourselves on another world.

Dreams are the facts from which we must proceed.

Thank God we're not like America. Everyone wants to look like they're 20. In Europe we admire grown-up women; I think men revere older women.

No one can draw more out of things, books included, than he already knows. A man has no ears for that to which experience has given him no access.

In earlier religions the spirit of the time was expressed through the individual and confirmed by miracles. In modern religions the spirit is expressed through the many and confirmed by reason.

Real intimacy; real love has to do with a joining of the mind, a joining of the spirit, a joining of the heart.

I remember those great days when we were at $176 million before the Reagan Revolution came to town.

Don't try to change the package more than you try and change the product.