Far too many people have forsaken the simplicity which is in Christ and have instead pursued the complexity and labour of religion (2 Corinthians 11:3).
Paul was one of the most religious people ever to live. In spite of his religious efforts, he was condemned to hell until he trusted Christ as Saviour.
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.
