I have no greater joy than to hear that my children walk in truth.
Deuteronomy 6:7
And thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thine house, and when thou walkest by the way, and when thou liest down, and when thou risest up.
John's declaration of greatest joy at hearing that his children walk in truth invokes the Deuteronomic parental instruction statute. Deuteronomy 6:7 establishes the diligent transmission of covenant truth to children as the primary obligation of the covenant community's ongoing life — sitting, walking, lying down, rising up. The fruit of that statutory instruction is precisely what John rejoices over: children who have received the truth and walk in it. The elder's joy is the Deuteronomic statute's intended outcome — the generational transmission of covenant truth producing covenant walkers.