Sentence:  A term which could be seen as a high <WSD>boundary term</WSD> ('the enemy' as opposed to 'the friend') is used, but Paul tells them, as it were, to dismantle such a boundary "from the inside", by undertaking acts of love and compassion. 
Meaning of the word marked with <WSD> tags:  A word or phrase that is used for othering; a term that serves to identify someone or something as other than the speaker.