Tertullian

“ I require reason in His goodness, because nothing else can properly be accounted good than that which is rationally good; much less can goodness itself be detected in any irrationality. More easily will an evil thing which has something rational belonging to it be accounted good, than that a good thing bereft of all reasonable quality should escape being regarded as evil. Now I deny that the goodness of Marcion’s god is rational, on this account first, because it proceeded to the salvation of a human creature which was alien to him. ”

“ By what rule, however, can an unjust benevolence, displayed on behalf of a stranger, to whom not even an honest one is legitimately due, be defended as a rational one? For what is more unrighteous, more unjust, more dishonest, than so to benefit an alien slave as to take him away from his master, claim him as the property of another, and suborn him against his master’s life ”

“ Besides, the rule of loving a stranger or enemy is preceded by the precept of your loving your neighbour as yourself; and this precept, although coming from the Creator’s law, even you ought to receive, because, so far from being abrogated by Christ, it has rather been confirmed by Him. For you are bidden to love your enemy and the stranger, in order that you may love your neighbour the better. The requirement of the undue is an augmentation of the due benevolence. ”