The second teaching of Bahá’u’lláh is ..

The second teaching of Bahá’u’lláh is the oneness of the world of humanity. Every human creature is the servant of God. All have been created and reared by the power and favor of God; all have been blessed with the bounties of the same Sun of divine truth; all have quaffed from the fountain of the infinite mercy of God; and all in His estimation and love are equal as servants. He is beneficent and kind to all. Therefore, no one should glorify himself over another; no one should manifest pride or superiority toward another; no one should look upon another with scorn and contempt; and no one should deprive or oppress a fellow creature. All must be considered as submerged in the ocean of God’s mercy. We must associate with all humanity in gentleness and kindliness. We must love all with love of the heart. Some are ignorant; they must be trained and educated. One is sick; he must be healed. Another is as a child; we must assist him to attain maturity. We must not detest him who is ailing, neither shun him, scorn nor curse him, but care for him with the utmost kindness and tenderness. An infant must not be treated with disdain simply because it is an infant. Our responsibility is to train, educate and develop it in order that it may advance toward maturity.

 `Abdu'l-Bahá, The Promulgation of Universal Peace