A Brahmana knows a Brahmana in the same way as the nusband knows the wife. A king knows his minister and a monarch knows a monarch.
ब्राह्मणं ब्राह्मणो वेद भर्ता वेद स्त्रियं तथा। अमात्यं नृपतिर्वेद राजा राजानमेव च॥