Science has made us gods even before we are worthy of being men.

A body of work such as Pasteur's is inconceivable in our time: no man would be given a chance to create a whole science. Nowadays a path is scarcely opened up when the crowd begins to pour in.

One must credit an hypothesis with all that has had to be discovered in order to demolish it.

Science had better not free the minds of men too much, before it has tamed their instincts.