गुरुरग्निर्द्विजातीनां वर्णानां ब्राह्मणो गुरुः ।
पतिरेव गुरुः स्त्रीणां सर्वस्याभ्यागतो गुरुः ॥५.१॥

patireva guruḥ strīṇāṃ sarvasyābhyāgato guruḥ |
gururagnirdvijātīnāṃ varṇānāṃ brāhmaṇo guruḥ ||5.1||

the fire is the Guru for the twice-born; for all colours, the Brahmin is the Guru; the husband is the Guru for the wife; and for all, the guest is the Guru

[originally, a ‘twice-born’ (Dvija) signified a Brahmin. Later, it came to mean Brahmin, Kshatriya, and Vaishya. By ‘colours’, the colour of the skin is meant. Thus, the Brahmin is the Guru for people of all types of skin colours.]

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Excerpt from the book “Old Chanakya Strategy: Aphorisms” by Rajen Jani