What is blood line?

Famous quotes containing the words line and/or blood:

    The parent must not give in to his desire to try to create the child he would like to have, but rather help the child to develop—in his own good time—to the fullest, into what he wishes to be and can be, in line with his natural endowment and as the consequence of his unique life in history.
    Bruno Bettelheim (20th century)

    No sleep. The sultriness pervades the air
    And binds the brain—a dense oppression, such
    As tawny tigers feel in matted shades,
    Vexing their blood and making apt for ravage.
    Herman Melville (1819–1891)