What is branch of knowledge?

Famous quotes containing the words knowledge and/or branch:

    The only fence against the world is a thorough knowledge of it.
    John Locke (1632–1704)

    When I am finishing a picture I hold some God-made object up to it—a rock, a flower, the branch of a tree or my hand—as a kind of final test. If the painting stands up beside a thing man cannot make, the painting is authentic. If there’s a clash between the two, it is bad art.
    Marc Chagall (1889–1985)