Now faith is the substance of things hoped for, the evidence of things not seen. – Hebrews 11:1 NKJV
But without faith it  is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.- Hebrews 11:6 NKJV
Only an evil, adulterous generation would demand a miraculous sign, but the only sign I will give them is the sign of the prophet Jonah. ” Then Jesus left them and went away. – Matthew 16:4 NLT
One of the twelve disciples, Thomas (nicknamed the Twin), was not with the others when Jesus came. They told him, “We have seen the Lord!” But he replied, “I won’t believe it unless I see the nail wounds in his hands, put my fingers into them, and place my hand into the wound in his side.” Eight days later the disciples were together again, and this time Thomas was with them. The doors were locked; but suddenly, as before, Jesus was standing among them. “Peace be with you,” he said. Then he said to Thomas, “Put your finger here, and look at my hands. Put your hand into the wound in my side. Don’t be faithless any longer. Believe!” “My Lord and my God!” Thomas exclaimed. Then Jesus told him, “You believe because you have seen me. Blessed are those who believe without seeing me.” – John 20:24-29 NLT
Two blind men were sitting beside the road. When they heard that Jesus was coming that way, they began shouting, “Lord, Son of David, have mercy on us!” “Be quiet!” the crowd yelled at them. But they only shouted louder, “Lord, Son of David, have mercy on us!” When Jesus heard them, he stopped and called, “What do you want me to do for you?” “Lord,” they said, “we want to see!” Jesus felt sorry for them and touched their eyes. Instantly they could see! Then they followed him. – Matthew 20:30-34 NLT