2 Samuel 2:26

Knowest thou not that it will be bitterness in the latter end! The Vulgate renders this, "Art thou not aware that desperation is dangerous?" This is a very obvious truth, but probably Abner had in his mind something more statesmanlike. The struggle was for the empire over all Israel, and whoever won would be king over both sides. But every man slain meant a blood feud, which would continue even after the kingdom was united; and Abner probably felt that his own slaughter of Asahel that day would render his position in David's realm difficult and dangerous. Among the Arab tribes quarrels are very common, but bloodshed rare, because of the blood feud which follows. Moderation was thus necessary on both sides, while cruelty and the immoderate use of victory would sow the seeds of future trouble.