Subtil

 2Sa 13:3  But Amnon had a friend, whose name was Jonadab, the son of Shimeah David's brother: and Jonadab was a very subtil man. 

David was just told his house would never escape the sword. This is the start of that yet, here I want you to see the person used to set things in motion.

Jonadab, the son of Shimeah, the brother of David. Yet Shimeah wasn't just a friend of Amnon, he was a cousin, a blood relative.

Jonadab's whole purpose in the Bible was to start the contention, the violence in the family of David.

He was subtil.

That specific word is used 2 other times in the Bible.

Pro 7:10  And, behold, there met him a woman with the attire of an harlot, and subtil of heart. 

When talking of the Adultress.

Gen 3:1  Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden? 

When speaking of the serpent in the Garden.

Not company any respectful young man should be keeping.

Jonadab's whole purpose in the Bible was to bring violence and death to the Household of David.

Every now and then we must remember that not every messenger, or adviser is a friend. Not every friend and family member wishes us well.

Jonadab was an adviser to Amnon and later we find he was also privy to the plans of Absalom. He played both sides against each other.

Jonadab set the world on fire, just to watch it burn.

A word to the wise. Watch those that are subtil.