PAST, n. That part of Eternity with some small fraction of which we
have a slight and regrettable acquaintance. A moving line called the
Present parts it from an imaginary period known as the Future. These
two grand divisions of Eternity, of which the one is continually
effacing the other, are entirely unlike. The one is dark with sorrow
and disappointment, the other bright with prosperity and joy. The
Past is the region of sobs, the Future is the realm of song. In the
one crouches Memory, clad in sackcloth and ashes, mumbling penitential
prayer; in the sunshine of the other Hope flies with a free wing,
beckoning to temples of success and bowers of ease. Yet the Past is
the Future of yesterday, the Future is the Past of to-morrow. They
are one -- the knowledge and the dream.

Ambrose Bierce