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The key is to keep improving, to keep working hard.
I keep challenging myself because I don't want to repeat.
A good programmer is someone who always looks both ways before crossing a one-way street.
A sound mind in a sound body, is a short, but full description of a happy state in this World: he that has these two, has little more to wish for; and he that wants either of them, will be little the better for anything else. Men’s happiness or misery is most part of their own making. He, whose mind directs not wisely, will never take the right way; and he, whose body is crazy and feeble, will never be able to advance in it.
The more you know yourself, the more patience you have for what you see in others.