Does adhering to this principle require that you shun unbelievers entirely? The Scriptural answer to that question is no.
فَٱلرَّسُولُ بُولُسُ أَظْهَرَ ٱلِٱعْتِبَارَ ٱلْحُبِّيَّ « لِشَتَّى ٱلنَّاسِ » ،‏ بِمَنْ فِيهِمْ غَيْرُ ٱلْمُؤْمِنِينَ .‏