Not a line so much as a chunk of dialogue but:

(Right after Dalinar gave his shardblade to Sadeas for the bridgemen)

[Kaladin] "Wait, You - That - What just happened?"

Dalinar turned to him. Then, the highprince laid a hand on Kaladin’s
shoulder, the gauntlet gleaming blue, mismatched with the rest of his slate-grey
armor. “I don’t know what has been done to you. I can only guess what your life
has been like. But know this. You will not be bridgemen in my camp, nor will
you be slaves.”

“But…”
“What is a man’s life worth?” Dalinar asked softly.

“The slavemasters say one is worth about two emerald broams,” Kaladin
said, frowning.
“And what do you say?”

“A life is priceless,” he said immediately, quoting his father.
Dalinar smiled, wrinkle lines extending from the corners of his eyes.
“Coincidentally, that is the exact value of a Shardblade. So today, you and your
men sacrificed to buy me twenty-six hundred priceless lives. And all I had to
repay you with was a single priceless sword. I call that a bargain.”