Jesus is the perfect man as He lived a sinless life and fulfilled the law perfectly, which suits only Him.
Jesus is described as the perfect man because He embodied the ideal of human holiness, as highlighted in Psalm 1, which details the blessedness of the man who does not walk in the counsel of the wicked. This description reflects Jesus, the only individual who has perfectly adhered to God's law in thought, word, and deed. Unlike all other humans, who bear the stain of original sin, Jesus was completely sinless, fulfilling the law's demands completely and thus serving as our perfect substitute. His life and actions showcase a flawless alignment with God's will, making Him the only one fit to atone for our sins and secure our salvation.
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