"According to my principles, every master has his true and certain value. Praise and criticism cannot change any of that. Only the work itself praises and criticizes the master, and therefore I leave to everyone his own value."

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If I care to listen to every criticism, let alone act on them, then this shop may as well be closed for all other businesses. I have learned to do my best, and if the end result is good then I do not care for any criticism, but if the end result is not good, then even the praise of ten angels would not make the difference.

— Abraham Lincoln