"See to it that no one takes you captive by philosophy and empty deceit, according to human tradition, according to the elementary spirits of the world, and not according to Christ". (Colossians 2:8)
What is Christian? What makes anything Christian? Not that it has to do with theology, not that it has to do with ministry, not that it has to do with church business, and so forth. What makes anything Christian is that it reflects Christ. It is “according to Christ.”
“We reach the sacred watchword here, and pause to listen to it. ‘Not according to Christ,’ not on His line, not measured by Him, not referred to Him, not so that He is Origin and Way and End and All. The ‘philosophy’ in question would assuredly include Him somehow in its terms. But it would not be ‘according to Him.’ It would take its first principles and draw its inferences, a priori and from other regions, and then bring Him in as something to be harmonized and assimilated, as far as might be. But this would mean a Christ according to the system of thought, not a system of thought according to the blessed Christ. . . . It must have Him for Alpha and for Omega, and for all the alphabet between. It must be dominated all over by Him.”
H. C. G. Moule, Colossians and Philemon Studies, pages 142-143.
--Ray Ortlund, also quoting H.C.G. Moule