My attempt.
我們內心是否平和在很大程度上是由我們是否能生活在現實之中所決定的。
To a great extent, whether we are able to be in peace or not is up to whether we are able to live in the reality or not.
我們內心是否平和在很大程度上是由我們是否能生活在現實之中所決定的。
To a great extent, whether we are able to be in peace or not is up to whether we are able to live in the reality or not.