“It is difficult to say what is impossible, for the dream of yesterday is the hope of today and the reality of tomorrow.”
Robert H. Goddard
An optimist is a person who sees only the lights in the picture,
whereas a pessimist sees only the shadows.
An idealist, however, is one who sees the light and the shadows,
but in addition sees something else:
the possibility of changing the picture,
of making the lights prevail over the shadows.