Abraham Lincoln kept the US united and freed black Americans from slavery.

To achieve these historic feats, he relied on a mastery of the written and spoken word. In honor of his 206th birthday, we've collected a few of his most inspiring quotes.

On genius

On hypocrisy

On reading

On struggle

On taking action

On determination

On slavery

On enemies

On work

On honesty

On the Civil War

From political genius to scientific genius

22 Quotes That Take You Inside Albert Einstein's Revolutionary Mind >

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