"Your honesty is not to be based either on religion or policy. Both your religion and policy must be based on it. Your honesty must be based, as the sun is, in vacant heaven; poised, as the lights in the firmament, which have rule over the day and over the night."
"Men are more evanescent than pictures, yet one sorrows for lost friends, and pictures are my friends. I have none others. I am never long enough with men to attach myself to them; and whatever feelings of attachment I have are to material things."
"He who has learned what is commonly considered the whole art of painting, that is, the art of representing any natural object faithfully, has as yet only learned the language by which his thoughts are to be expressed."