Pavlov...on the demands of science
Facts are the air of science. Without them the man of science can never rise. Without them your theories are vain surmises. But while you are studying, experimenting, observing, do not remain content with the surface of things. Do not become a mere recorder of facts, but try to penetrate the mystery of their origin, seek persistently for all laws that govern them. And then - modesty. Never think you know all. Though others may flatter you, retain the courage to say "I am ignorant". Never be proud...Pride will make you lose objectivity...And lastly, science must be your passion. Remember that science claims a man's whole life. If you had two lives, they would not suffice. Science demands an undivided allegiance from its followers. Your work and your research must always be your passion.
- Testament to the Academic Youth of his Country, 1936