Jesus often rebuked his disciples for their lack of faith. They needed to have faith to command God's Spirit; so as to accomplish the works of Christ. Peter sank into the water for his lack of faith during Jesus first presence, (
Mat 14:27-31) but he continued to learn. After Jesus was crucified and resurrected to heaven, awaiting his return, Peter seemed to have gained full control of our Father's Spirit. (
Acts 5:15-16 of 12-32)