John 3:2

John 3:2. And said unto him, Rabbi, we know that thou art a teacher come from God: for no man can do these miracles that thou doest, except God be with him.

He admitted the truth as far as he could see it. The miracles of Christ proved him to be a divinely-commissioned teacher. Always be willing to go as far as you can go in the pursuit of truth. If you cannot see everything at once, see all that you can see. Be not of a cavilling spirit; be frank and teachable as this man was.