Shared ground
These verses present a strategy for keeping Yahweh’s instructions constantly in view. The text joins inner attention (“heart and soul”) with outward, repeatable reminders (on the body, in speech, and on home and civic entryways). The setting assumes a settled life in the land, where habits and household teaching carry identity across generations.
The stated purpose is not abstract: it is “that your days may be multiplied” for both parents and children in the land promised to the fathers. The language frames stability and length of life in the land as connected to sustained remembrance and transmission of Yahweh’s words.
Where interpretation differs (only where needed)
One live question is whether “bind them…on your hand” and “between your eyes” should be understood as literal practices (physical items worn on the body) or as vivid imagery for keeping the words central in what one does (hand) and thinks/perceives (eyes/forehead area).
Another question is scope: whether “these my words” refers mainly to the nearby covenant instruction in this section of Deuteronomy, or whether it points more broadly to Yahweh’s commands as a whole.
A smaller question is how strictly to read “as the days of the heavens above the earth”: some take it as strong poetic language for very long endurance, while others see it as a more direct promise of lasting stability in the land under covenant faithfulness.
Why the disagreement exists
The passage mixes concrete actions (teach, talk, write) with body-based images (“sign,” “symbols,” “between your eyes”) that can be read either as metaphorical description or as a prompt toward physical reminders. Also, “these words” naturally points back to Moses’ current instruction, but Deuteronomy often treats the covenant teaching as a unified whole, making both readings plausible.
What this passage clearly contributes
Explicitly, the text links covenant memory to multi-setting repetition: personal interior commitment, family instruction in daily routines, and visible reminders in household and public spaces (“doorposts” and “gates”). It also explicitly ties these practices to generational continuity and extended life in the promised land (v. 21), emphasizing the community’s long-term future rather than a private spirituality. Deuteronomy 6:4–9 shows this is a recurring Deuteronomy theme, not an isolated idea.