Know that the amount of criticism you receive may correlate somewhat to the amount of publicity you receive.

When there happens to be a weapon of mass destruction suspect site in an area that we occupy and if people have time, they'll look at it.

There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns - the ones we don't know we don't know.

There are things that we know, and there are things that we don't know. Then there are the things that we don't even know that we don't know. Those are the things that are the hardest.

The reality is that terrorists can attack any time at any minute, 24 hours a day, using a variety of techniques, in any place at all. And it's not possible to defend in every place, against every technique, against every conceivable approach. It means that you can't stop every terrorist attack. Innocent men, women and children are going to be killed if terrorists are determined to do it.

You will launch many projects, but have time to finish only a few. So think, plan, develop, launch and tap good people to be responsible. Give them authority and hold them accountable. Trying to do too much yourself creates a bottleneck.

When you raise issues with the President, try to come away with both that decision and also a precedent. Pose issues so as to evoke broader policy guidance. This can help to answer a range of similar issues likely to arise later.