One must learn by doing the thing, for though you think you know it, you have no certainty until you try.

Source: This quote is from an Athenian tragedy “The Trachiniae” by Sophocles. Read Complete Book: Click Here Misattribution: This quote is often misattributed to Aristotle, but no authentic source for this attribution is yet found.

You have to learn from the mistakes of others. You won’t live long enough to make them all yourself.

Source: This quote or it’s variants are often attributed to Hyman G. Rickover, Eleanor Roosevelt, Samuel Levenson, and Lao Tzu, but no authentic source for these attributions is yet found.