John 16:31

Do ye now believe? - And will ye continue to believe? Ye are now fully convinced; and will ye in the hour of trial retain your conviction, and prove faithful and steady?

Do ye now believe? - Do you truly and really believe? This question was evidently asked to put them on a full examination of their hearts. Though they supposed that they had unshaken faith - faith that would endure every trial, yet he told them that they were about to go through scenes that would test them, and where they would need all their confidence in God. When we feel strong in the faith we should examine ourselves. It may be that we are deceived; and it may be that God may even then be preparing trials for us that will shake our faith to its foundation. The Syriac and Arabic read this in the indicative as an affirmation - "Ye do now believe." The sense is not affected by this reading.