Peter's failure is not fatal or final because of God's great love and grace. Peter's restoration calls him to follow Christ through loving Him and serving Him.
Thomas is considered the classic doubter of faith but John 20 also describes his declaration of faith
Easter Saturday reminds us of the waiting between the past and the potential Psalm 40 leads us in a space of waiting for the Lord
Good Friday reminds us of Christ's death on the cross for our sins - but also the impact of our sinfulness that Christ died for.