Still, there can be no doubt that the Greek conception of slavery is one of the points in which their view of life runs most counter to our own. Centuries of Christianity have engendered in us the conviction, or rather, the instinct, that men are equal at least to this extent, that no one has a right explicitly to make of another a mere passive instrument of his will--that every man, in short, must be regarded as an end in himself. Yet even here the divergence between the Greek and the modern view is less extreme than it appears at first sight. For the modern man, in spite of his perfectly genuine belief in equality (in the sense in which we have just defined the word), does nevertheless, when he is confronted with racial differences, recognise degrees of inferiority so extreme, that he is practically driven into the Aristotelian position that some men are naturally slaves. The American, for example, will hardly deny that such is his attitude towards the negro. The negro, in theory, is the equal, politically and socially, of the white man; in practice, he is excluded from the vote, from the professions, from the amenities of social intercourse, and even, as we have recently learnt, from the most elementary forms of justice. The general and a priori doctrine of equality is shattering itself against the actual facts; and the old Greek conception, "the slave by nature", may be detected behind the mask of the Christian ideal. And while thus, even in spite of itself, the modern view is approximating to that of the Greeks, on the other hand the Greek view by its own evolution was already beginning to anticipate our own. Even Aristotle, in formulating his own conception of slavery, finds it necessary to observe that though it be true that some men are naturally slaves, yet in practice, under conditions which give the victory to force, it may happen that the "natural" slave becomes the master, and the "natural" master is degraded to a slave. This is already a serious modification of his doctrine. And other writers, pushing the contention further, deny altogether the theory of natural slavery. "No man," says the poet Philemon, "was ever born a slave by nature. Fortune only has put men in that position." And Euripides, the most modern of the Greeks, writes in the same strain: "One thing only disgraces a slave, and that is the name. In all other respects a slave, if he be good, is no worse than a freeman." [Footnote: Euripides, Ion. 854]