What is the context?
The command is not presented as inaccessible knowledge hidden in heaven or across the sea. The people have received the word and can speak and take it to heart, so that they may put it into practice.
The choice is concrete: love the Lord, walk in His ways, and keep His commands, or turn away to other gods. The alternatives are life and blessing or death and loss of the land. Heaven and earth are called as witnesses, giving the appeal public and enduring seriousness.
Choosing life means loving, obeying, and holding fast to the Lord, who is Himself their life. It is more than preferring a favorable outcome while refusing the relationship and conduct described. The promise is addressed to Israel entering the land sworn to Abraham, Isaac, and Jacob.
How is this passage commonly understood?
The USCCB notes explain the word in the mouth as memorized and recited, and the word in the heart as inwardly appropriated. Wesley reads the command in connection with the grace of the gospel and Paul’s use of the passage. His emphasis on divine help and the people’s response should not be mistaken for a claim that the passage teaches salvation through unaided effort.
Where does this fit in God's plan?
Romans 10:5–13 explicitly takes up the language of ascent, descent, and the word near the mouth and heart. Paul applies it to the proclaimed word of faith: confessing Jesus as Lord and believing that God raised Him from the dead. The same Lord receives those who call on Him, Jew and Greek alike. This is a stated New Testament use of the passage, rather than a hidden meaning invented for the geography.
What is our position?
We don't have a position on this passage yet. When our study reaches a conclusion the text supports, it will appear here.
Where can I study this further?
No deeper study linked yet.