2 Corinthians 13:5 “Examine yourselves to see whether you are in the faith; test yourselves. Do you not realize that Christ Jesus is in you – unless, of course, you fail the test?”
Christ reveals Himself in His people. So all the proof that is needed of Christ speaking through another, to you, is within you. If ye would just try the spirit by the Spirit, ye shall surely discover its truth; BUT in order to test, we must first be tested proving our own sincerity.