When one side defeats another in battle, to the victor goes the spoils. This means that the victor enters the camp of the defeated and takes its valuable possessions (including women, children, material goods, etc.). With this truth in mind, the apostle Paul warned the believers at Colosse to be on guard, knowing that men would seek to spoil them through philosophy and vain deceit. In other words, accepting the philosophies of men, or false doctrines, is likened to losing a battle and allowing the enemy to rob the believer of his most valuable possessions. It is important to understand that although a believer can never lose his salvation, he can be robbed of his stability, growth, peace, and joy.
Separation is scriptural under a variety of different scenarios. Most commonly, believers understand that they are to separate from unbelievers (2 Corinthians 6:14). This does not imply that believers should not witness to the lost but that there should be no “fellowship” between the two. The Bible also indicates that there are times in which one believer should separate from another believer. Most often, this happens because of the propagation of false doctrine (Romans 16:17-18; 2 Thessalonians 3:6) or immoral practices (1 Corinthians 5:11). However, there may also be instances when believers separate for the purpose of furthering the work of God (Galatians 2:6-9).
