"It is an easy thing to praise and blame, but not so easy to know what to praise and what to blame."

"I have offended God and mankind because my work didn't reach the quality it should have."

"The eye, which is called the window of the soul, is the principal means by which the understanding can most completely and abundantly appreciate the infinite works of nature."

"Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature, because in her inventions nothing is lacking and nothing is superfluous."

"Life well spent is long."