We are certainly all-in when we can see Jesus working miracles in our lives. But our faith gets shaken when we cannot see His works and start doubting even the existence of God. If our faith is based on the works of God in our lives then we will not go far with Him but like a drug addict keep coming back to Him only when we run out of money/blessings. Peter was still immature and did not understand what his response should be when Jesus foretold his denial.