But take diligent heed to do the commandment and the law, which Moses the servant of the LORD charged you, to love the LORD your God, and to walk in all his ways, and to keep his commandments, and to cleave unto him, and to serve him with all your heart and with all your soul. 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.