And add proof of value.
And now, Lord, look at their threats, and grant it to Your bond-servants to speak Your word with all confidence, 30 while You extend Your hand to heal, and signs and wonders take place through the name of Your holy servant Jesus.”
-- Acts 4:29-30
It has been a common refrain to show proof that our claims about Jesus are real. The high priests asked Jesus for a sign and he told them they would only get the sign of Jonah, who spent 3 days in the belly of the great fish. These Christians asked that Jesus would give them signs and wonders to prove that their words about him were true. They understood that people react to proof much better than to just words. We only have words and proofs are rarer then during the early church, but they still happen. We can ask for them too, and God may give them to us, if we will use them wisely.