But still, it must be with his own consent, I.E. The consent of the majority, " giving it either by themselves, or through their representatives."

但是这仍须得到他自己的同意，即得到大多数的同意，由他们自己或选出的代表所表示的大多数同意“

耶鲁公开课 - 公正课程节选

I agree involves saying "Yes" to something. It's when two people think alike.

agree 表示同意某事。一般用在两个人想法一致的时候。

I agree课堂 - SpeakingMax英语口语达人