Dans la nature rien ne se crée, rien ne se perd, tout change.In nature nothing is created, nothing is lost, everything changes.
Change, Nature, Biology
The human mind adjusts itself to a certain point of view, and those who have regarded nature from one angle, during a portion of their life, can adopt new ideas only with difficulty.
Mind, Nature, Chemistry
We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.
Truth, Trust, Reason