두문장이 헷갈리는데요


he must have a very faint perception of its beauty and dignity
who does not know this, and who does not further know,
that one being is elevataed above another,
in proportion as he possesses this capability.
굵은 글씨 부분 that은 어디와 연결되는 것인가요? 굵은 글씨부분이 해석이 잘 안되네요.

for a multitude of causes, unknown to former times,
are now acting with a combined force to blunt the discriminating powers of the mind, and, unfitting it for all voluntary exertion,
to reduce it to a state of almost savage topor.
여기도 굵은 글씨 부분을 어떻게 해석해야할지 모르겠네요

도와주세요~