"Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant."
"Science demands from a man all his life. If you had two lives that would not be enough for you. Be passionate in your work and in your searching."
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Source: Ivan Petrovich Pavlov (1966). “Essential works”
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"Don't become a mere recorder of facts, but try to penetrate the mystery of their origin."
"When the dog is repeatedly teased with the sight of objects inducing salivary secretion from a distance, the reaction of the salivary glands grows weaker and weaker and finally drops to zero."
"While you are experimenting, do not remain content with the surface of things."
"Men are apt to be much more influenced by words than by the actual facts of the surrounding reality"
"Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise."