It is true, absolutely speaking, that, without revelation, mankind might take their theology on trust from philosophers, relying for their spirituality upon philosophic experts, as upon legal experts for the maintenance of their proprietary rights. But then we should expect of the Providence of God a greater concord of religious views among philosophers than at present obtains. Philosophy, were she our sole guide, should not be permitted to say and unsay.

Of God and His Creatures: 1.4