Good point. There are no talking donkeys in the Bible, or mysterious writing appearing on walls, or a staff that turns into a snake. You really know your Bible well.
With the resurrection of Jesus Christ, all such miracles have ceased. We don't need any other miracles. We have the empty cross. Roman Catholics are still looking for what has already been given to those with eyes to see.
But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas: For as Jonas was three days and three nights in the whale's belly; so shall the Son of man be three days and three nights in the heart of the earth." -- Matthew 12:38-40 "Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee.