The journey to God by faith is supernatural courage.
Peter feels a responsibility to respond, but out of prudence he asks for a command from Jesus, Who invites him to take courage; “come” is the approval that Peter awaits to take responsibility for his voluntary action.
Oppositions of the world lead to fear and toward new doubts, but faith can make people shout “Lord, save me!” (Mat 14:30) and make to hear the Christ’s encouragement; only with hope and confident abandonment in Jesus, the wind of the trial dies down.
Obedience to the commandments of love fulfills the work of the Father through the primacy of the service, seeking with all virtue and responsibility the purpose of life, not in power but in peace, with a sincere and faithful conscience to the truth.
The illusion of being one's own center and norm leads to justification, pollutes hearts with human traditions or bad intentions and opposes God’s will, rejecting or non-complying with His law.
Only in the sincere heart is founded the relationship with Christ for good intentions and commitments: the Pharisee deludes himself to observe the law without the need for grace and mercy, while the tax collector prays without reducing its responsibility and, feeling fragile and unworthy afore God’s holiness, he recognizes himself in need of justification.