I have not failed. I've just found 10,000 ways that won't work.
If we did the things we are capable of, we would astound ourselves.
Opportunity is missed by most people because it is dressed in overalls and looks like work.
Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.
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Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution.