Tho’ much is taken, much abides; and tho’
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, Lord Tennyson (1809-1892) English poet

“Ulysses,” ll. 65-70 (1842)
    (Source)