Absalom said to Ahithophel, “Give us your advice. What should we do?” … Ahithophel said to Absalom, “I would choose twelve thousand men and set out tonight in pursuit of David. I would attack him while he is weary and weak. I would strike him with terror, and then all the people with him will flee. I would strike down only the king and bring all the people back to you….” This plan seemed good to Absalom and to all the elders of Israel.
But Absalom said, “Summon also Hushai the Arkite, so we can hear what he has to say as well.” When Hushai came to him, Absalom said, “Ahithophel has given this advice. Should we do what he says? If not, give us your opinion.”
Hushai replied to Absalom, “The advice Ahithophel has given is not good this time….”
Absalom and all the men of Israel said, “The advice of Hushai the Arkite is better than that of Ahithophel.” For the Lord had determined to frustrate the good advice of Ahithophel in order to bring disaster on Absalom. (2 Samuel 16:20; 17:1-7, 14).
Absalom (unlike his father) didn’t consult God, but consulted men.
Ahithophel had a personal agenda. All he wanted to do is get revenge on David for what he had done to Uriah and Bathsheba. Notice Ahtihophel’s wording: “I will kill only the king” (v. 2).
What was Ahithophel’s beef with David? Uriah—the man whose wife David stole, the man whom David had killed to cover up his affair—was Ahithophel’s son (2 Samuel 23:34, 11:3)!
Hushai, the the other man who gave Absalom counsel, also had an agenda. Hushai is repeatedly given one description: Friend of David (2 Samuel 15:37, 16:16-17; 1 Chronicles 27:33). So Hushai’s sole focus is saving his friend’s life.
Humans always give their advice with their own bias or agenda.
It’s okay to talk to men and get their counsel, but always allow God to confirm or reject their advice.