I think Henley would be appropriate as well:
Out of the night that covers me,
Black as the pit from pole to pole,
I thank whatever gods may be
For my unconquerable soul.
In the fell clutch of circumstance
I have not winced nor cried aloud.
Under the bludgeonings of chance
My head is bloody, but unbowed.
Beyond this place of wrath and tears
Looms but the Horror of the shade,
And yet the menace of the years
Finds and shall find me unafraid.
It matters not how strait the gate,
How charged with punishments the scroll.
I am the master of my fate:
I am the captain of my soul.
Defeat is not mechanically possible for us. Certainly, we may not win this fight, but it is not possible for us to lose. For losing can only occur if, our will broken and our power spent, we find it impossible to press on.
Take a look at what we have already accomplished, those who may yet give in to despair. We have called for aid from unlikely sources, and we have been answered. Every voice added strengthens not only our numbers, but our resolve.
Though our opponents struck us deeply and dearly, we are not on the defensive. We have issued our challenge, and daily proclaim it more boldly than before.
And they are listening.