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KJV - Since ye seek a proof of Christ speaking in me, which to you-ward is not weak, but is mighty in you.
ASV - seeing that ye seek a proof of Christ that speaketh in me; who to you-ward is not weak, but is powerful in you:
BBE - Seeing that you are looking for a sign of Christ giving out his word in me; who is not feeble in relation to you, but is strong in you:
WEB - seeing that you seek a proof of Christ who speaks in me; who toward you is not weak, but is powerful in you.
YLT - since a proof ye seek of the Christ speaking in me, who to you is not infirm, but is powerful in you,