In the overmental creation, each element of the manifestation is an essential part of the wider oneness and harmony, although these individual beings or elements work to emphasize their own line of action and do not generally become aware of or focused on the Oneness. This leads to a creation that creates oneness out of conflict or opposition, by making even the conflict part of the wider action or purpose. This is a world of duality where good and bad, light and dark, coexist and actually support one another for the unseen larger purpose. The supramental creation brings in the awareness of Oneness at the individual level, so that each element is both aware of its individual role and its essential unity with all else in the manifestation. This brings in the opportunity for a more harmonious development than the world based in conflict and opposition which we see in the lower stages of the evolutionary progression.
“The Overmind follows out diversities and divergent possibilities on their own lines of divergence: it can allow contradictions and discords, but it makes them elements of a cosmic whole so that they care forced, however unwittingly and in spite of themselves, to contribute their shares to its wholeness.”
“The supramental gnostic being, on the contrary, would not only found all his living on an intimate sense and effective realisation of harmonic unity in his own inner and outer life or group-life, but would create a harmonic unity also with the still surviving mental world, even if that world remained altogether a world of Ignorance. For the gnostic consciousness in him would perceive and bring out the evolving truth and principle of harmony hidden in the formations of the Ignorance; it would be natural to his sense of integrality and it would be within his power to link them in a true order with his own gnostic principle and the evolved truth and harmony of his own greater life-creation. That might be impossible without a considerable change in the life of the world, but such a change would be a natural consequence of the appearance of a new Power in Nature and its universal influence. In the emergence of the gnostic being would be the hope of a more harmonious evolutionary order in terrestrial Nature.”
Sri Aurobindo, The Life Divine, Book 2, Part 2, Chapter 27, “The Gnostic Being”