"Never think that you already know all. However highly you are appraised, always have the courage to say to yourself-I am ignorant."
"Thanks to our present surgical methods in physiology we can demonstrate at any time almost all phenomena of digestion without the loss of even a single drop of blood, without a single scream from the animal undergoing the experiment."
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Source: Ivan Petrovich Pavlov (1957). “Experimental psychology, and other essays”
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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."
"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."
"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"