The Soul appears to be finite because of ignorance. When ignorance is destroyed the Self which does not admit of any multiplicity truly reveals itself by itself: like the Sun when the clouds pass away.

The unity of existence is the foundation of all ethical codes. Properly understood, it widens the bounds of charity beyond humanity to include the animal world as well. Self-love is the mainspring of man‘s action and the raison d'être of his love for others. We learn from Non-dualistic Vedanta that the true Self of man is the Self of all beings. Therefore, self-love finds its expression and fulfilment in love for all. – Swami Nikhilananda

By fulfilling his dharma a man marches along the path of progress until he attains the supreme dharma of all beings, namely, the realization of Truth. (p. 28)

All human beings, according to the conception of the Vedic seers, form the physical body of the Purusha, or Cosmic Person. The spiritual men form, as it were, his head, the warriors His arms, the merchants and traders His thighs and the labourers His feet. A healthy co-ordination among these four classes of people sustains the strength and the well-being of a society, as a harmony among the four principal physical parts insures the strength and well-being of a body. (p. 30)