John 16:29

His disciples say, Lo, now speakest thou plainly, and speakest no dark saying. Now we know that thou knowest all things, and needest not that any man should ask thee: by this we believe that thou camest forth from God.

Strangely, the supernatural understanding of what was in the apostles' hearts seems from these words to have been more convincing to them than even the raising of Lazarus.

Needest not that any man should ask thee ... refers to the omniscience of Christ. This vision of his Godhead was clear to the apostles at this point. They had seen his deity shining through the veil of his humanity and cried out, "Now we know ... by this we believe."

However, as Hendriksen noted, there were still some dark waters to be crossed. He said:

The light is shining brightly now, more brightly than ever before; but within a few hours it will be obscured once more. Yet, the confession made here will linger on in their subconscious minds, until, by and by, when the Lord rises from the dead and (a little later) pours out his Spirit, it will bear the fruit of calm and steadfast assurance, and this fruit will abide for ever.[22]

Jesus was not deceived by the apostles' glowing words. He knew their weakness and promptly moved to strengthen them and warn them against the awesome events that were rushing upon them.