Verse 24. "Only fear the Lord" - Know, respect, and reverence him.
"Serve him" - Consider him your Lord and Master; consider yourselves his servants.
"In truth" - Be ever honest, ever sincere; with all your heart- have every affection engaged in the work of obedience; act not merely from a principle of duty, but also from a pious, affectionate sense of obligation. Act towards your God as an affectionate child should act towards a tender and loving parent.
"Consider how great things" - Review the history of your fathers, review your own life; see what interpositions of power, mercy, goodness, and truth, God has displayed in your behalf! Has he not daily loaded you with his benefits?
Verse 25. "Ye shall be consumed" - If ye do wickedly you shall be destroyed, your kingdom destroyed, and your king destroyed. Here they had set before them life and good, death and evil. Never was a people more fully warned, and never did a people profit less by the warning; and they continue to this day monuments of God's justice and forbearance. Reader, What art thou? Perhaps a similar monument. Consider therefore what great things God has done for thee.