WILL-WORSHIP

In Colossians 2:23, "a show of wisdom in will-worship," for ethelothreskia), a word found nowhere else but formed exactly like "will-worship": worship originating in the human will as opposed to the divine, arbitrary religious acts, worthless despite their difficulty of performance.

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.