Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Codex Alera
Gaius Sextus' speech to Aria and Isana during Princeps' Fury. Isana has just clued into how Sextus plans on using her to inadvertently drum up support for Tavi, even though she really can't stand all the politicking he does. It is very effective in driving home the immensity of the burden Sextus carries, how the decisions he has made—especially the one in Kalare—deeply affect him, but also how he is willing to shoulder those burdens so long as they mean the Realm stands.
Isana stared at Gaius for a moment. Then she said, "How can you live with yourself?"
The First Lord stared at her for a moment, his eyes cold. Then he spoke in a very quiet, precise, measured voice. "I look out my window each day. I look out my window at people who live and breathe. At people who have not been devoured by civil war. At people who have not been ravaged by disease. At people who have not starved to death, who have not been hacked apart by enemies of humanity, at people who are free to lie and steal and plot and complain and accuse and behave in all manner of repugnant ways because the Realm stands. Because law and order stands. Because something other than simple violence shapes the course of their lives. And I look, wife of my son, mother of my heir, at the very few who have had the luxury of living their lives without being called upon to make hideous decisions I would not wish upon my worst enemies, and who consequently find such matters morally appalling when they consider them—because they have not had to be the ones that dealt with them." He took a short, hard swallow of wine. "Feh. Aquitaine thinks me his enemy. The fool. If I truly hated him, I'd give him the Crown."
"Fidelias! Behind you!"- and everything that comes after.