As in most things, defining a “proof” can be a relative thing. Because people always try to rebut every interpretation, the final decision must ultimately be one of faith, as it ought to be. Divine Revelation from God (Matthew 16:17) is the only true guarantee of any doctrine, no matter how sure we are of any “proof text”.
The following, however, are provided as the basis for doctrinal study, to help remove any “reasonable doubt”.