What is the greatest gift that science has given to mankind? It is the power to make mankind believe in the truth. ---Compton (USA)

The same is true for [difficulty]. Facing the cliff You won't be able to see a single crack in the cliff in a hundred years. But with an axe, you can advance inch by inch. You have to advance foot by foot. Keep accumulating. Leap forward will come. Breakthrough will follow. --- Hua Luogeng (China)

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The ocean of truth. Let all the undiscovered things lie before my eyes. Let me explore. ---Newton (UK)

Man's bounden duty is to have the courage to explore the truth.---Copernicus (Poland)

. The truth may be on the side of a few people.---Plato (Greece)

Raising a question is often more important than solving a problem, because solving a problem may be just a teaching or experimental skill. But raising new questions, new possibilities, and looking at old problems from a new perspective all require Creative imagination. And it marks the real progress of science.---Einstein (USA)

A soul without imagination is like an observatory without a telescope.---Einstein (USA)

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The development of the thinking world. In a sense, it is the continuous escape from surprise. --- Einstein (USA)