Newer may not be better

"Then some of the scribes and Pharisees answered him, saying, “Teacher, we wish to see a sign from you.” But he answered them,“An evil and adulterous generation seeks for a sign, but no sign will be given to it except the sign of the prophet Jonah. For just as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth." -- Matthew 12:38-40 

Has anyone ever built a better mousetrap? Well, there may have been different traps, but never better. Many people may ask for improvement and believe that the current version is past date. But no matter what others may think, old time mouse traps still work like a charm. Some things in life are sufficient enough with no need for any other alternative.

The scribes and Pharisees of Jesus' day were no different than the skeptics of our day. There are always people looking for some kind of new and different sign to prove the reality of God and his power. They fail to accept the one most profound sign of all time... the resurrection of Jesus. The Lord took our sins to the grave and rose from the dead three days later. No other alternative will ever be needed.
Do you often find yourself frustrated with unbelievers when you share your faith? Do they press you for proof that God exists? You need nothing new or better evidence than the resurrected Christ. Jesus was satisfied with this sign and has never provided any other alternative. Paul made it clear in Romans 10:9, "...if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved."