In man-machine symbiosis, it is man who must adjust: The machines can't.
One man's constant is another man's variable.
If a listener nods his head when you're explaining your program, wake him up.
Learning French is trivial: the word for horse is cheval, and everything else follows in the same way.
Dealing with failure is easy: Work hard to improve. Success is also easy to handle: You've solved the wrong problem. Work hard to improve.
You think you KNOW when you learn, are more sure when you can write, even more when you can teach, but certain when you can program.