Union with God signifies the deep spiritual connection between the divine and the human, a central theme in religious thought that highlights harmony, surrender, and transcendence. Authors such as Henry William Clark view it as an active yielding, in which God becomes the origin of human action, while an anonymous Italian describes it as complete harmony of wills.
Evelyn Underhill emphasizes Christ's role as the intermediary to this union, and The Urantia Book presents it as mutual spiritual development. Although these viewpoints differ, they all point to the idea that union with God is both a transformative aim and a journey toward holiness, grounded in love, alignment, and divine favor.