Verse 24 proves it. For if you don't believe that I Am He, you will die in your sins. What else needs to be said?!
In verse 17 it is said, 'then his disciples remembered that it was written, 'Zeal for your house has eaten me up.' Jesus had a zeal for God's house and it was evident, the question we have to ask ourselves is, do we have a zeal for God and his church, is it evident.