Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of scientists. Without them you never can fly. Without them your theories are vain efforts.


Bequest of Pavlov to the Academic Youth of His Country, Science, Volume 83, Number 2155, April 17, 1936 (p. 369)

Ivan Pavlov Quotes

Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of scientists. Without them you never...

Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of scientists. Without them you never...

Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of scientists. Without them you never...

Perfect as is the wing of a bird, it never could raise the bird up without resting on air. Facts are the air of scientists. Without them you never...