The Lord had determined to

2 Samuel 17:1-14
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.”
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.
Ahithophel’s advice is to strike quickly, and only against the person of the king - so avoiding civil war. But Hushai gains time for David by a scheme which appeals to Absalom’s vanity. Ahithophel has the foresight to realize the probable consequences - hence his suicide.
Why?
What is the good idea, people’s idea won’t be good idea, only the way with the Lord will be good way.
David let Hushai stayed in team of Absalom is good idea to affect decision of Absalom, meanwhile it is the Lord who make things changed.
Even Ahithophel suggested wonderful idea but did not be accepted is the Lord makes it done.
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押撒龍沒有帶過兵，笏塞提這個建議。大家卻都說好。
為什麼這個意見大家說好？ 1.笏塞喜愛權利慾望，讓他率領全國軍隊。這個特點也成為弱點。
最強的時候往往也是最弱的時候。
這些人若有跟隨大衛的人回來反而會分權或是成為敵人。最好這些敵人全被殺掉。2.全國的軍隊：完全是人的觀念，以為人多好，目前只統治耶路撒冷，希望統治全以色列。我們常常很聰明，以為依靠人多馬多可以得勝。人往往在最得意的地方成為我們最大的弱點。
如果押撒龍依照亞希多弗的意見會如何呢？這個問題在聖經中不是這樣發展，即使如此，神可能有其他的安排。
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How?
Praise the name of the Lord, for God’s way is beyond us.