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.
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Orr, James, M.A., D.D. General Editor. "Entry for 'WILL-WORSHIP'". "International Standard Bible Encyclopedia". <http://classic.studylight.org/enc/isb/view.cgi?number=T9190>. 1915.