It is useful to constantly observe, note, and consider.
The greater the man's soul, the deeper he loves.
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.
The artist sees what others only catch a glimpse of.
First study the science, and then practice the art which is born of that science.
Man has much power of discourse which for the most part is vain and false; animals have but little, but it is useful and true, and a small truth is better than a great lie.