Winston Churchill said this quote

As long as we have faith in our own cause and an unconquerable will to win, victory will not be denied us.

~ Winston Churchill

Don't argue about the difficulties. The difficulties will argue for themselves.

~ Winston Churchill

Never give in--never, never, never, never, in nothing great or small, large or petty, never give in except to convictions of honor and good sense. Never yield to force; never yield to the apparently overwhelming might of the enemy.

~ Winston Churchill

Let us make sure that the supreme fact of the 20th century is that they tread the same path.

~ Winston Churchill