Compare John 20:19 and Acts 2:14, and answer this question: What explains the change in Jesus’ disciples, from being full of fear, to being full of boldness?
Answer: The early post-resurrection appearances (Mark 16:9-18; John 20:1-21:23; Matthew 28:9-20; Luke 24:13-32, 34, 36-49; 1 Cor 15:5-7; Acts 1:3-8).