Walking on water was no problem for Jesus, who had divine power. For Peter, it became a problem when his faith wavered. To walk on water by faith, one must first wait for God's word commanding the action. Only then can one take steps in faith, trusting God to enable and save them. Religious people today also need God's word as authorization before acting or organizing. Faith is needed to continue walking by God's instructions despite life's storms, believing He has the power and will act as He has said.