What is urge on?

Famous quotes containing the word urge:

    The urge to kill, like the urge to beget,
    Is blind and sinister. Its craving is set
    Today on the flesh of a hare: tomorrow it can
    Howl the same way for the flesh of a man.
    Andrei Voznesensky (b. 1933)

    I should not urge thy duty past thy might.
    I know young bloods look for a time of rest.
    William Shakespeare (1564–1616)