Mr. Buckle says (Vol. I. p. 250) that "Skepticism, which in physics must always be the beginning of science, in religion must always be the beginning of toleration." We have seen that in physics skepticism is rather the end of science than its beginning, and the same is true of toleration. Skepticism does not necessarily produce toleration. The Roman augurs, who laughed in each other's faces, were quite ready to assist at the spectacle of Christians thrown to the lions. Skeptics, not having any inward conviction as a support, rest on established opinions, and are angry at seeing them disturbed. A strong belief is sufficient for itself, but a half-belief wishes to put down all doubts by force. This is well expressed by Thomas Burnet (Epistola 2, De Arch. Phil.): "Non potui non in illam semper propendere opinionem, Neminem irasci in veritate defendenda, qui eandem plene possidet, viditque in claro lumine. Evidens enim, et indubitata ratio, sibi sufficit et acquiescit: aliisque a scopo oberrantibus, non tam succenset, quam miseretur. Sed cum argumentorum adversantium aculeos sentimus, et quodammodo periclitari causam nostram, tum demum æstuamus, et effervescimus." The least firm believers have often been the most violent persecutors. Nero persecuted the Christians; Marcus Antoninus persecuted them; but neither Nero nor Antoninus had any religious reason for this persecution. Antoninus, the best head of his time, was a sufficient skeptic to suit Mr. Buckle, as regards all points of the established religion, but his skepticism did not prevent him from being a persecutor. Unbelieving Popes, like Alexander VI. and Leo X., have persecuted. True toleration is not born of unbelief, as Mr. Buckle supposes, but of a deeper faith. Religious liberty has not been given to the world by skeptics, but by such men as Milton, Baxter, Jeremy Taylor, and Roger Williams. So far from general skepticism being the antecedent condition of intellectual progress and discovery, it is a sign of approaching intellectual stagnation and decay. A great religious movement usually precedes and prepares the way for a great mental development. Thus the religious activity born of Protestantism showed its results in England in the age of Elizabeth, and in a general outbreak of intellectual activity over all Europe. On the other hand, the skepticism of the eighteenth century was accompanied by comparative stagnation of thought throughout Christendom.