The first one is from the Racket mailing list by Neil Van Dyke.

You’ve read a lot already. I don’t know how much practical programming experience you have, but this reminds me to make a suggestion for anyone reading this email who is learning programming and doing a lot of reading…

If someone has access to a computer, then my suggestion at this point is make sure that they are spending more time practicing programming than they are spending on reading.

By reading books and doing problem sets only, and reasoning about programming in their head atop that, then someone might be able to understand programming theory as a mathematician might. But if they want intuition and insight into how to build and evolve sustainable systems in the real world, then I’m not aware of any substitute for practical experience in programming.

the other is from Alan Perlis.

What you know about computing other people will learn. Don't feel as if the key to successful computing is only in your hands. What's in your hands, I think and hope, is intelligence: the ability to see the machine as more than when you were first led up to it, that you can make it more.

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