What is pin clover?

Famous quotes containing the words clover and/or pin:

    I’m in clover now, nor know
    Who made honey long ago.
    Edmund Blunden (1896–1974)

    A man is a beggar who only lives to the useful, and, however he may serve as a pin or rivet in the social machine, cannot be said to have arrived at self-possession.
    Ralph Waldo Emerson (1803–1882)