Why is it a miracle for brethren to dwell together in unity?

The unity of brethren is described as a miracle because, by nature, humanity is at enmity with God, and thus with one another. Psalm 133 emphasizes the miraculous nature of this unity, which can only be accomplished through God's grace and the power of the Holy Spirit. Such unity showcases a transformation in hearts and minds, where believers, acknowledging their shared identity as sinners saved by grace, find joy and peace. This unity is a powerful testament to God's redemptive work in the lives of His people, enabling them to love and support one another authentically.