Perfect as the wing of a bird may be, it will never enable the bird to fly if unsupported by the air. Facts are the air of science. Without them a man of science can never rise.
Ivan PavlovMen are apt to be much more influenced by words than by the actual facts of the surrounding reality
Ivan PavlovDon't become a mere recorder of facts, but try to penetrate the mystery of their origin.
Ivan Pavlov