Raise your quality standards ...

Raise your quality standards as high as you can live with, avoid wasting your time on routine problems, and always try to work as closely as possible at the boundary of your abilities. Do this, because it is the only way of discovering how that boundary should be moved forward.
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 Edsger Dijkstra

Quotes from the same author

The ability of discerning high quality unavoidably implies the ability of identifying shortcomings.
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 Edsger Dijkstra
The tools we use have a profound and devious influence on our thinking habits, and therefore on our thinking abilities.
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 Edsger Dijkstra
Program testing can be used to show the presence of bugs, but never to show their absence!
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 Edsger Dijkstra
Testing shows the presence, not the absence of bugs.
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 Edsger Dijkstra
Write a paper promising salvation, make it a "structured" something or a "virtual" something, or "abstract," "distributed" or "higher-order" or "applicative" and you can almost be certain of having started a new cult.
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 Edsger Dijkstra