Who said "I've seen empires wage war. The cost is always too high."?

This quote is attributed to Dax.

I've seen empires wage war. The cost is always too high. - Dax

"I've seen empires wage war. The cost is always too high."

Dax War

"I'm not sure what I'm more afraid of - that I'll never see Jadzia again, or that I will."

"Eight lifetimes of experience, and I'm still learning."

"Being joined changed me in ways I never expected."

"The symbiont remembers, but I have to live with the consequences."

"Some battles are worth fighting."

"Sometimes you have to become the monster to stop the monsters."

"Skynet sent me back through time to kill you."

"War teaches us the value of peace."