We cannot know what faith is if we have never had it, and we cannot obtain it as long as we deny it. Faith and doubt cannot exist in the same mind at the same time, for one will dispel the other.
A man was meant to be doubtful about himself, but undoubting about the truth; this has been reversed. Nowadays the part of a man that a man does assert is exactly the part he ought not to assert - himself. The part he doubts is exactly the part he ought not to doubt - the Divine Reason.
Women are quite able to make friends with a man; but to preserve such a friendship - that no doubt requires the assistance of a slight physical antipathy
If a parricide is more wicked than anyone who commits homicide-because he kills not merely a man but a near relative-without doubt worse still is he who kills himself, because there is none nearer to a man than himself.
The materialist is sure that history has been simply and solely a chain of causation, just as the [lunatic] is quite sure that he is simply and solely a chicken. Materialists and madmen never have doubts.
When in doubt, tell the truth. That maxim I did invent, but never expected it to be applied to me. I did say, "When you are in doubt," but when I am in doubt myself I use more sagacity.
For, were it not good that evil things should also exist, the omnipotent God would almost certainly not allow evil to be, since beyond doubt it is just as easy for Him not to allow what He does not will, as for Him to do what He will.