In forming your plan for your future you need to distinguish three different questions: What is possible? What is likely to happen? What is desirable… - Richard Hamming

When you know something cannot be done, also remember the essential reason why, so later, when the circumstances have changed, you will not say 'It can't be done.

Moral: to the extent you can choose, work on problems you think will be important.

I am concerned with educating and not training you. ...Education is what, when, and why to do things. Training is how to do it. Either one without the other is not of much use. You might think education should precede training, but the kind of educating I am trying to do must be based on your past experiences and technical knowledge.