Leo and Barry in “Unfinished Business”

Leo

Do you know how many rebels we lost over the years, Barry, trying to defeat those Nazi bastards?

Barry

Countless, I'm sure.

Leo

Not countless. Counted. Eighteen thousand, three hundred twenty-two. Three thousand, six hundred and seventy-nine were under my watch. And I felt the weight of each of their deaths. I still do, some years after they died.

Barry

Leo, look, I–

Leo

The thing I realized is that to continue to lead, to be clear-headed, I had to grieve those men and women I lost. So I did. Each and every one... Look, Barry, you want me to help you move a meta-human nuclear bomb that some genius with nearly every meta-power on this board is after. I will do what I can, as long as your head is on straight. Because if I die before Ray and I get married, Ray will kill me.