Matthew 4:23

And He went throughout all Galilee, teaching in their synagogues and preaching the good news (gospel) of the kingdom, and healing every kind of disease and every kind of sickness among the people (demonstrating and revealing that He was indeed the promised Messiah).

Where Jesus is at work, there will be a demonstration of His promises.  The promises have not ended, nor has Jesus stopped healing disease or sickness.  Our faith builds from the revelation of the word and the demonstration of Jesus acting in our lives.  We need to reach out in faith to receive our healing.