Preconceived ideas are like searchlights which illumine the path of the experimenter and serve him as a guide to interrogate nature. They become a danger only if he transforms them into fixed ideas-this is why I should like to see these profound words inscribed on the threshold of all the temples of science: 'The greatest derangement of the mind is to believe in something because one wishes it to be so.'
Louis PasteurIf science has no country, the scientist should have one, and ascribe to it the influence which his works may have in this world.
Louis PasteurBlessed is he who carries within himself a God, an ideal, and who obeys it: ideal of art, ideal of science, ideal of the gospel virtues, therein lie the springs of great thoughts and great actions; they all reflect light from the Infinite.
Louis PasteurThe grandeur of the acts of men are measured by the inspiration from which they spring.
Louis Pasteur