Moral excellence comes about as a result of habit. We become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts.

The future belongs to science and those who make friends with science.

Now, as a nation, we don't promise equal outcomes, but we were founded on the idea everybody should have an equal opportunity to succeed. No matter who you are, what you look like, where you come from, you can make it. That's an essential promise of America. Where you start should not determine where you end up.

Standing in support of children is something we should all be able to get behind, regardless of party affiliation.

The problems of victory are more agreeable than those of defeat, but they are no less difficult. 

Do not overrate what you have received, nor envy others. He who envies others does not obtain peace of mind.

Just because something doesn't do what you planned it to do doesn't mean it's useless.

It may be possible to gild pure gold, but who can make his mother more beautiful?

A dream doesn't become reality through magic; it takes sweat, determination and hard work. 

Yes, we've still got more work to do. More work to do for every American still in need of a good job or a raise, paid leave or a decent retirement; for every child who needs a sturdier ladder out of poverty or a world-class education; for everyone who has not yet felt the progress of these past seven and a half years.

One thing I want to make clear, as far as my own rebirth is concerned, the final authority is myself and no one else, and obviously not China's Communists.

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