It is possible that science may in principle describe the structure and actions of man as a part of physical nature.
It is clear, however, that man is not
thus completely accounted for. Left wholly out of consideration is the realm
of ideas
and idealism
, of understanding
and emotion
, that gives life its human significance.
1) In the above sentence, what role does the adverb 'thus' play?
2) If the phrase '
of understanding
and emotion' is inserted phrase, the underlined word 'that' is non-restrictive relative pronoun and any grammatical problem doesn't occur, but as the phrase '
of ideas
and idealism' and the phrase '
of understanding
and emotion' form a perfect parallel relationship, It is difficult for me to treat '
of understanding
and emotion' as a inserted phrase.
If the phrase '
of ideas
and idealism' and the phrase '
of understanding
and emotion' form a perfect parallel relationship, the word 'that' become restrictive relative pronoun and grammatical problem occur.

What do you think about that?
I'd like to hear your opinion.
In addition, even though two parallel phrases isn't connected through 'or' or 'and', Is it no matter?
Thank you in advance for your help