John 12:49

For I spake not from myself; but the Father that sent me, he hath given me a commandment, what I should say, and what I should speak. And I know that his commandment is life eternal; the things therefore which I speak even as the Father hath said unto me, so I speak.

The words of Jesus are eternally important because they are the words of God. Significantly, our Lord never requested men to believe him AS A MAN, but as the TRUE MESSENGER OF GOD. What a difference prevails among human authorities. The rule of thumb for claiming attention on the human level is this: a bishop has spoken; a pope has published an encyclical; the council has made a decision; the head of the church has spoken; an archbishop has said, etc., etc. Not even the holy Christ himself, while on earth as a man, demanded that his words be accepted on the basis of any earthly trust or position that he occupied, his sole claim upon human credibility and acceptance being in this alone, that he delivered the TRUE WORD OF ALMIGHTY GOD! This is the unique significance and authority of the word of Christ.