2. Why was that day so crucial, and what helped the disciples?

2 You have good reason to view that day as the most crucial in history, affecting the whole future of mankind. The sacrificial death of the Leader, Jesus, fulfilled many ancient prophecies and provided the basis for everlasting life to those believing in him. (Isaiah 53:5-7; John 3:16) But the apostles, stunned and bewildered by the traumatic events of that night, became confused and fearful for a time. Peter even disowned Jesus. (Matthew 26:69-75) However, after the faithful apostles received the promised helper, holy spirit, they became bold and untroubled. (John 14:16, 17) Thus, when Peter and John experienced tough opposition and were put in custody, they prayed to God for help in speaking his word “with all boldness.” Their prayer was answered.—Acts 4:1-3, 29-31.