The manual is often used as a 131-page study guide that covers practical and spiritual steps for effective outreach: Go to product viewer dialog for this item. Evangelismo Sobrenatural
The author distinguishes between "preaching," which explains truth, and "witnessing," which is sharing a personal encounter with Christ that others cannot refute.
A core tenet is that the gospel is most effective when confirmed by miracles. Signs are intended to capture attention, confirm the message, and bear witness to God's presence.