What is nerve centre?

Famous quotes containing the words nerve and/or centre:

    There must be some nerve and heroism in our love, as of a winter morning.
    Henry David Thoreau (1817–1862)

    Marriage and deathless friendship, both should be inviolable and sacred: two great creative passions, separate, apart, but complementary: the one pivotal, the other adventurous: the one, marriage, the centre of human life; and the other, the leap ahead.
    —D.H. (David Herbert)