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Ignorance, when voluntary, is criminal, and a man may be properly charged with that evil which he neglected or refused to learn how to prevent.

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Nothing is so good for an ignorant man as silence; and if he was sensible of this he would not be ignorant.

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To be proud of learning is the greatest ignorance.

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In these matters the only certainty is that nothing is certain.

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What is now proved was only once imagined.

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The great successful men of the world have used their imaginations, they think ahead and create their mental picture, and then go to work materializing that picture in all its details, filling in here, adding a little there, altering this a bit and that bit, but steadily building, steadily building.

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We are what and where we are because we have first imagined it.

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Five thousand balloons, capable of raising two men each, could not cost more than five ships of the line; and where is the prince who can afford so to cover his country with troops for its defense as that 10,000 men descending from the clouds might not in many places do an infinite deal of mischief before a force could be brought together to repel them?

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First comes thought; then organization of that thought, into ideas and plans; then transformation of those plans into reality. The beginning, as you will observe, is in your imagination.

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All the works of man have their origin in creative fantasy. What right have we then to depreciate imagination.

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