Do you believe that Jesus is the Son of God? That was the question Jesus asked the man he had just healed.
"“Rabbi,” his disciples asked him, “why was this man born blind? Was it because of his own sins or his parents’ sins?” “It was not because of his sins or his parents’ sins,” Jesus answered. “This happened so the power of God could be seen in him. We must quickly carry out the tasks assigned us by the one who sent us. The night is coming, and then no one can work. But while I am here in the world, I am the light of the world.” Then he spit on the ground, made mud with the saliva, and spread the mud over the blind man’s eyes. He told him, “Go wash yourself in the pool of Siloam” (Siloam means “sent”). So the man went and washed and came back seeing!
John 9:2-7 NLT.
It wasn't enough that the man had been healed, there was something more.
"When Jesus heard what had happened, he found the man and asked, “Do you believe in the Son of Man?” The man answered, “Who is he, sir? I want to believe in him.” “You have seen him,” Jesus said, “and he is speaking to you!” “Yes, Lord, I believe!” the man said. And he worshiped Jesus.
John 9:35-38 NLT.
Being healed, receiving a miracle from God is good, but believing and coming into a relationship with God is what truly satisfies.