"Anytime I think about a product, I think about my family and friends.  Would they be proud of me if I put this out?"

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Only the mediocre are always at their best. If your standards are low, it is easy to meet those standards every single day, every single year. But if your standard is to be the best, there will be days when you fall short of that goal. It is okay to not win every game. The only problem would be if you allow a loss or a failure to change your standards. Keep your standards intact, keep the bar set high, and continue to try your very best every day to meet those standards. If you do that, you can always be proud of the work that you do.

— Mike Krzyzewski