Adam Clarke on Matthew 22:38

This is the first and great commandment - It is so,

1. In its antiquity, being as old as the world, and engraven originally on our very nature.

2. In dignity; as directly and immediately proceeding front and referring to God.

3. In excellence; being the commandment of the new covenant, and the very spirit of the Divine adoption.

4. In justice; because it alone renders to God his due, prefers him before all things, and secures to him his proper rank in relation to them.

5. In sufficiency; being in itself capable of making men holy in this life, and happy in the other.

6. In fruitfulness; because it is the root of all commandments, and the fulfilling of the law.

7. In virtue and efficacy; because by this alone God reigns in the heart of man, and man is united to God.

8. In extent; leaving nothing to the creature, which it does not refer to the Creator.

9. In necessity; being absolutely indispensable.

10. In duration; being ever to be continued on earth, and never to be discontinued in heaven.