The Jews wanted to see miracles to prove the truth of the Gospel. Jesus had performed many signs and wonders but they still refused to accept Him as the Messiah. When the Pharisees had requested a sign, Jesus answered them:
39 He answered, “A wicked and adulterous generation asks for a sign! But none will be given it except the sign of the prophet Jonah–Matt. 12:39 (NIV)
They had seen that sign because after three days, Jesus arose from the grave. We are not saved by signs, miracles or wisdom, we are saved by grace through faith. Head knowledge has to become heart knowledge before we receive saving grace. The power that resurrected Jesus from the grave is more powerful than any earthly force and is still available to each of us today. The foolishness of Jesus Christ is wiser than anything in the world and it is still available to us today. We just need to persevere in our faith and ask the Holy Spirit to grant us wisdom.
4 Let perseverance finish its work so that you may be mature and complete, not lacking anything. 5 If any of you lacks wisdom, you should ask God, who gives generously to all without finding fault, and it will be given to you.—James 1:4, 5 (NIV)