https://t.inks.page/wiki/Ivan_Pavlov Follow any website on Inks inks.page https://en.wikiquote.org/wiki/Ivan_Pavlov?t=2026-04-07 Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of a scientist. Without them you never can fly. Without them your "theories" are vain efforts.

• Bequest of Pavlov to the Academic Youth of His Country. Science, Vol. 83, Issue 2155, pg. 369 (1936)

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