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Vine's Expository Dictionary of NT Words
lit., "a pointing out" (apo, "forth," deiknumi, "to show"), a "showing" or demonstrating by argument, is found in 1 Corinthians 2:4 , where the Apostle speaks of a proof, a "showing" forth or display, by the operation of the Spirit of God in him, as affecting the hearts and lives of his hearers, in contrast to the attempted methods of proof by rhetorical arts and philosophic arguments.
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Vines, W. E., M. A. Entry for 'Demonstration'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/d/demonstration.html. 1940.