Those works, deeds, or actions would not occur if the conviction was not there. Faith is belief. You cannot look at or feel the belief. You can observe the fruits that are produced by belief. Those fruits would not exist if the belief were not there.
Faith is hope.
You cannot look at or touch the hope. But you can observe the attitudes and actions produced by the certainty that exists because the hope is there. If there was no hope, the certainty would not exist. The foundation of faith involves confidence in the unseen. You cannot see or touch the unseen that forms the foundation of faith.