The rooster's crow served as a wake-up call and reminder for Peter after he denied knowing Jesus three times. It reminded Peter that (1) he needed a spiritual awakening, (2) Jesus was still in control even during his arrest and trial, and (3) it was time for a new beginning as he wept bitterly over his denial. The crow also signaled that (4) it was time to get back to work in serving Jesus by strengthening the disciples and eventually helping establish the early Christian church.