…Thus the optimist believes, attempts, achieves. He stands always in the sunlight. Someday the wonderful, the inexpressible, arrives and shines upon him, and he is there to welcome it. His soul meets his own and beats a glad march to every new discovery, every fresh victory over difficulties, every addition to human knowledge and happiness. -- Helen Keller

Some work of noble note, may yet be done,
Not unbecoming men that strove with Gods.
The lights begin to twinkle from the rocks:
The long day wanes: the slow moon climbs: the deep
Moans round with many voices. Come, my friends,
'Tis not too late to seek a newer world.
Push off, and sitting well in order smite
The sounding furrows; for my purpose holds
To sail beyond the sunset, and the baths
Of all the western stars, until I die.
It may be that the gulfs will wash us down:
It may be we shall touch the Happy Isles,
Though much is taken, much abides; and though
We are not now that strength which in old days
Moved earth and heaven; that which we are, we are;
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.

(Alfred Tennyson, Ulysses)