The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.
Never let your sense of morals prevent you from doing what's right.
Humanity has the stars in its future, and that future is too important to be lost under the burden of juvenile folly and ignorant superstition.
A robot may not injure humanity or through inaction allow humanity to come to harm. [The Zeroth Law of Robotics]
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I have a dream that one day this nation will rise up and live out the true meaning of its creed: "We hold these truths to be self-evident: that all men are created equal."
The key to realizing a dream is to focus not on success but on significance - and then even the small steps and little victories along your path will take on greater meaning.