Unity implies oneness; that is, an indissoluble relationship between entities. On page 470 of "Science and Health with Key to the Scriptures" Mrs. Eddy in speaking of the wonderful sense of unity which would result if mankind were to recognize one God as Father, says: "With one Mind and that God, or good, the brotherhood of man would consist of Love and Truth, and have unity of Principle and spiritual power which constitute divine Science." Divine Science, then, relates to the unity between God and man, between Principle and its idea. When this is fully understood, true brotherhood will be established and unity and harmony will prevail.
Unity, moreover, presupposes likeness. When Christ Jesus declared, "I and my Father are one," he spoke out of his profound knowledge of God, and of spiritual man, his true selfhood, as the son of God, God's image and likeness. Man is the image and likeness of God only because of the unity, that is, the oneness, of God and man; therefore, since in essence man is the reflection and expression of the divine qualities, man would cease to be the son of God should he cease to be His likeness. Thus unity inheres in the likeness of qualities, in sameness. As in chemistry there can be no unity of elements except there be a chemical affinity, so in Science there can be no true unity between objects possessed of divergent qualities.
The brotherhood of man is of a necessity based upon man's unity with divine Principle, man's source. The fact of a common source makes this brotherhood possible. Man, that is, the compound idea which comprises all true ideas, expresses the qualities of God; therefore all ideas are united in the one Principle which is their source or origin. The unity which constitutes brotherhood is that which springs from a common fatherhood; and the fatherhood of God, that is, the fact that God is the source and origin of all, establishes the brotherhood in which each possesses, by reflection, the qualities common to all.
