'Voluntary' in the Bible

Let no man beguile you of your reward in a voluntary humility and worshipping of angels, intruding into those things which he hath not seen, vainly puffed up by his fleshly mind,

(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.

I wanted to keep him with me so that he could serve me in your place during my imprisonment for the gospel. forced, but voluntary.

but I did not want to do anything without first getting your consent, so that your goodness would not be, in effect, by compulsion but of your own free will.