He prays that All may be Christians, but compels None
My own desire is, for the common good of the world and the advantage of all mankind, that your people should enjoy a life of peace and undisturbed concord. Let those, therefore, who still delight in error, be made welcome to the same degree of peace and tranquillity which they have who believe. For it may be that this restoration of equal privileges to all will prevail to lead them into the straight path. Let no one molest another, but let every one do as his soul desires. Only let men of sound judgment be assured of this, that those only can live a life of holiness and purity, whom you call to a reliance on your holy laws. With regard to those who will hold themselves aloof from us, let them have, if they please, their temples of lies: we have the glorious edifice of your truth, which you have given us as our native home. We pray, however, that they too may receive the same blessing, and thus experience that heartfelt joy which unity of sentiment inspires.
Source: Life of Constantine (New Advent)