Commentaries:
Agur claims no great intelligence or superior understanding. He feels his education is lacking in the more important areas of life, like the proper way to live and the knowledge of God. He is only a common man with no special abilities, powers or privileges—in fact, he would like to know the person who could do some of these things.
In verses 5 and 6 he states his conclusion: To get the most and the best from life, we should believe God, not presuming that we can comprehend the effects of our actions without advice from God in His Word. God's Word cannot be improved upon; every word of God is pure, as gold and silver are pure (Psalm 12:6). The value of God's Word cannot be increased by adding to or taking from it, anymore than gold can be increased in value by alloying it with something else. He advises that we strive to do nothing that God forbids and leave nothing undone that God commands. This is the approach of a man whose sole aim is to please God, and who does not want to do or not do anything that might strain the relationship.
John W. Ritenbaugh
Christmas, Syncretism, and Presumption