65 Nay, my opponent says, if God is powerful, merciful, willing to save us, let Him change our dispositions, and compel us to trust in His promises. This, then, is violence, not kindness nor the bounty of the Supreme God, but a childish and vain strife in seeking to get the mastery. For what is so unjust as to force men who are reluctant and unwilling, to reverse their inclinations; to impress forcibly on their minds what they are unwilling to receive, and shrink from; to injure before benefiting, and to bring to another way of thinking and feeling, by taking away the former?
You who wish yourself to be changed, and to suffer violence, that you may do and may be compelled to take to yourself that which you do not wish, why do you refuse of your own accord to select that which you wish to do, when changed and transformed? I am unwilling, He says, and have no wish. What, then, do you blame God as though He failed you? Do you wish Him to bring you help, whose gifts and bounties you not only reject and shun, but term empty words, and assail with jocose witticisms?
Unless, then, my opponent says, I shall be a Christian, I cannot hope for salvation. It is just as you yourself say. For, to bring salvation and impart to souls what should be bestowed and must be added, Christ alone has had given into His charge and entrusted to Him by God the Father, the remote and more secret causes being so disposed. For, as with you, certain gods have fixed offices, privileges, powers, and you do not ask from any of them what is not in his power and permitted to him, so it is the right of Christ alone to give salvation to souls, and assign them everlasting life.
For if you believe that father Bacchus can give a good vintage, but cannot give relief from sickness; if you believe that Ceres can give good crops, Aesculapius health, Neptune one thing, Juno another, that Fortune, Mercury, Vulcan, are each the giver of a fixed and particular thing—this, too, you must needs receive from us, that souls can receive from no one life and salvation, except from Him to whom the Supreme Ruler gave this charge and duty. The Almighty Master of the world has determined that this should be the way of salvation—this the door, so to say, of life; by Him alone is there access to the light: nor may men either creep in or enter elsewhere, all other ways being shut up and secured by an impenetrable barrier.
Source: Against the Heathen (New Advent)