Brennan and Aldo in “The Sense in the Sacrifice”

Brennan

Booth wants to kill Pelant, which is fine. He's a very bad man, he's murdered...we don't know how many people. What if there's someone worse and we need Pelant to catch that killer?

Aldo

[rolls his eyes] Oh god... [looks at Brennan] It's these ethical dilemmas that drove me out of the priesthood.

Brennan

I need to know what Booth is going to do.

Aldo

So you can protect Pelant.

Brennan

He's more valuable alive than dead, that's all.

Aldo

It depends which Booth is there.

Brennan

[confused] Seeley Booth, the one I love.

Aldo

No, I mean, like all of us, he has two sides to him. There's one side that wants to save the world and one side that wants to take care of the people he loves. Those two collide, well, that's what you called a "tortured soul".

Brennan

There's no such thing as a soul.

Aldo

Says you, but Booth values nothing higher than his soul, yet he's willing to sacrifice his soul by killing Pelant.

Brennan

Why?

Aldo

[smirks] You, of course. It's always gonna come down to you.