NET
23 Even though they have the appearance of wisdom with their self-imposed worship and humility achieved by an unsparing treatment of the body—a wisdom with no true value—they in reality result in fleshly indulgence.
Darby
23 (which have indeed an appearance of wisdom in voluntary worship, and humility, and harsh treatment of the body, not in a certain honour,) to [the] satisfaction of the flesh.
KJV
23 Which things have indeed a shew of wisdom in will worship, and humility, and neglecting of the body; not in any honour to the satisfying of the flesh.