Peter denied knowing Jesus, Peter went to cussing and raising all sort of hell in his denial of Jesus, the the rooster crowed, then Peter repentance and then Peter becoming a leader of the Christian faith ........What an example we have.....many, many more examples in Scripture for us to learn by , but we have to read God's word to find , we have to listen to the Holy Spirit to learn ...........KNOCK & it will be opened--SEEK & you will find---ASK & it will be given Amen!