My opinion - nay more, my conviction - is that, in the present state of science, as you rightly say, spontaneous generation is a chimera; and it would be impossible for you to contradict me, for my experiments all stand forth to prove that spontaneous generation is a chimera.

These three things-work, will, success-fill human existences. Will opens the door to success, both brilliant and happy. Work passes these doors, and at the end of the journey success comes in to crown one's efforts.

There is a time in every man's life when he looks to his God, when he looks at his life, when he wonders how he will be remembered.

When I approach a child, he inspires in me two sentiments; tenderness for what he is, and respect for what he may become.

Luck favors the mind that is prepared.

Whatever your career may be, do not let yourselves become tainted by a deprecating and barren scepticism.

There is no such thing as a special category of science called applied science; there is science and its applications, which are related to one another as the fruit is related to the tree that has borne it.