"You would laugh monster. But let me remind you.
Within this weak sack of meat and bone, uncared for by his god and wept
for by none, beats a heart. A human heart, that carries with it the
strength and courage of all mankind.Within that sack of meat is the
hope, the will, and the fury of every man women and child from every
corner of the Imperium. Within that weak sack of meat, festooned in thin
armor and weapons only powerful in numbers , beats the heart of a man.
And for ten thousand years, the hearts of men have beaten, strongly, in
defiance of your so called "powers". For ten thousand years, your black
crusades
have been pushed back, beaten down, and made a mockery of, by weak sacks
of flesh with cheap weapons and disposable equipment.
For that weak sack of flesh that you so gleefully mock is no
supersoldier, no immortal warrior, no creature cursed by chaos like you.
He is a man, an Imperial Gaurdsman drawn from some forgotten corner of
the Imperium to fight for his species and for the safety of the people
he loves. He is a factory worker. a farmer, a storekeeper, a father, a
brother, a son, a mere man. And against creatures like you teeming and
numberless, powered by the wills of thirsting gods...He holds the line.
He has held the line for ten thousand years.
So what is your excuse, monster?"

-dont know where this is from, but its accurate.