These things are written so that you may come to believe (John 20.31)
Seeing is believing. Thomas needed tangible proof that Jesus really had risen from the dead. He could only believe it if he could see and touch the risen Lord.
Such physical proof is not available for us, but we have the witness of those who were actually there, and the testimony of real people whose lives were radically and permanently changed by their encounter with the risen Christ.
The experience of many Christians is that faith comes first: believing leads to seeing. When you live from day to day in the faith that there is a good and loving God, life changes. You become aware of a purpose in your life. Things make sense that previously didn’t before.
As Jesus said, ‘Blessed are they who have not seen, but yet believe’.