Making and worshipping an idol is foolishness and a lie, because a manmade image can never truthfully represent the Eternal God. For a son of God, worshipping idols is irrational (Acts 17:29); to look to something physical as important or more important than God defies all wisdom. The way the world looks to physical objects is superstition (e.g., good luck charms, religious crosses, shrines).
Martin G. Collins
The Second Commandment
God commands Zion (a type of the church) to lift up its voice to reveal Him to the people. In His ensuing description of Himself, God proclaims Himself as the almighty, all-wise Creator. He has such incomparable power and wisdom that the combined might and intelligence of all nations are as nothing before Him. In our childish vanity, we think of ourselves as being of some account, but we are so insignificant that, compared to Him, all humanity combined is less than nothing and worthless! Considering this testimony, whose law should take precedence—God's or man's?
John W. Ritenbaugh
The Sixth Commandment (Part 2): War! (1997)
Other Forerunner Commentary entries containing Isaiah 40:13:
1 Corinthians :
1 John 5:14-15