"There a centurion's servant, whom his master valued highly, was sick and about to die. The centurion heard of Jesus and sent some elders of the Jews to him, asking him to come and heal his servant. When they came to Jesus, they pleaded earnestly with him, "This man deserves to have you do this, because he loves our nation and has built our synagogue." So Jesus went with them.
He was not far from the house when the centurion sent friends to say to him: "Lord, don't trouble yourself, for I do not deserve to have you come under my roof. That is why I did not even consider myself worthy to come to you. But say the word, and my servant will be healed. For I myself am a man under authority, with soldiers under me. I tell this one, 'Go,' and he goes; and that one, 'Come,' and he comes. I say to my servant, 'Do this,' and he does it."When Jesus heard this, he was amazed at him, and turning to the crowd following him, he said, "I tell you, I have not found such great faith even in Israel." Then the men who had been sent returned to the house and found the servant well.
Jesus has been « touched » by centurion’s faith because he didn’t need to see for believing.In a way, centurion was « convicted » that Jesus’ word was powerful .This kind of faith’s attitude has been called by Jesus « great faith ».If you want your faith increases, believe more in the Gospel even if everything you see seem to be impossible.
Remember, « blessed are those who have not seen and yet have believed » John 20 ;29.