John 13:17
If you know these things, you are blessed if you do them — the beatitude is contingent on action, on knowledge made flesh in practice. Knowing without doing remains sterile; blessedness (makarios) comes through the integration of understanding and embodiment. The disciples have witnessed and received the footwashing; now they must become agents of the same grace. This verse articulates John's entire ethical vision: true discipleship is not intellectual assent but transformation of life, a radical reorientation of one's being toward others in the pattern of Christ.