Never think that you already know all. However highly you are appraised, always have the courage to say of yourself: I am ignorant.
Никогда не думайте, что вы уже всё знаете. И как бы высоко ни оценивали вас, всегда имейте мужество сказать себе: я невежда.

Psychologists
Ivan Pavlov
Russian and Soviet physiologist (1849-1936). He won the 1904 Nobel Prize for digestive physiology, and his conditioned reflex became the bedrock on which Watson and Skinner built behaviorism.
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Ivan Pavlov's Other Quotes
If you want new ideas, read old books.
I will not sacrifice even the hind leg of a frog to the kind of social experiment that the Communist government is conducting in Russia.
A conditioned reflex is a temporary connection between any agent of the external world and a definite activity of the organism.
Gradualness and discipline. This is the most important thing. From the very beginning of your work, train yourself to the strictest gradualness in accumulating knowledge.
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