名人名言搜索（英文）

The great experimental principle, then, is doubt, that philosophic doubt which leaves to the mind its freedom and initiative, and from winch the virtues most valuable to investigators in physiology and medicine are derived.

—  Claude Bernard

Men who have excessive faith in their theories or ideas are not only ill-prepared for making discoveries; they also make poor observations.

—  Claude Bernard

It is what we know already that often prevents us from learning.

—  Claude Bernard