He who possesses most must be most afraid of loss.
Just as iron rusts from disuse... even so does inaction spoil the intellect.
I say that the power of vision extends through the visual rays to the surface of non-transparent bodies, while the power possessed by these bodies extends to the power of vision.
Some promises and time disappoint us
Experiment is the sole interpreter of the artifices of Nature.
Many will think they may reasonably blame me by alleging that my proofs are opposed to the authority of certain men held in the highest reverence by their inexperienced judgments; not considering that my works are the issue of pure and simple experience.