John 3:2

John 3:2. The same came to Jesus by night, 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.

The miracles were accepted as a proof of Christ’s mission, and if they do not seem to be quite such a proof to us at this distance, they were a most marvelous and necessary proof at the first. Perhaps they have ceased because, that first work being done, the testimony can now stand upon its own strength, and men reading it may judge it to be of God if they will. But to Nicodemus it was quite clear that Christ could not have worked his miracles, except God were with him.