But take diligent heed, etc. - Let us examine the force of this excellent advice; they must ever consider that their prosperity and continued possession of the land depended on their fidelity and obedience to God; to this they must take diligent heed.
Do the commandment - They must pay the strictest regard to every moral precept.
And the law - They must observe all the rites and ceremonies of their holy religion.
Love the Lord your God - Without an affectionate filial attachment to their Maker, duty would be irksome, grievous, and impossible.
Walk in all his ways - They must not only believe and love, but obey: walk not in your own ways, but walk in those which God has pointed out.
Keep his commandments - They must love him with all their heart, soul, mind, and strength, and their neighbor as themselves.
Cleave unto him - They must be cemented to him, in a union that should never be dissolved.
Serve him - They must consider him as their Master, having an absolute right to appoint them when, where, how, and in what measure they should do his work.
With all your heart - Having all their affections and passions sanctified and united to him.
And with all your soul - Giving up their whole life to him, and employing their understanding, judgment, and will, in the contemplation and adoration of his perfections; that their love and obedience might increase in proportion to the cultivation and improvement of their understanding.