Everyone who observes himself doubting observes a truth, and about that which he observes he is certain; therefore he is certain about a truth. Everyone therefore who doubts whether truth exists has in himself a truth on which not to doubt.... Hence one who can doubt at all ought not to doubt the existence of truth.
Reagan did not suffer from the dismal plague of doubts which has assailed so many politicians in our times and which has rendered them incapable of clear decisions.
We are going to a new world... and no doubt it is there that everything is for the best; for it must be admitted that one might lament a little over the physical and moral happenings of our own world.
I do not doubt but the majest and beauty of the world are latent
in any iota of the world;
I do not doubt there is far more in trivialities, insects,
vulgar persons, slaves, dwarfs, weeds, rejected refuse than
I have supposed.
For, dear me, why abandon a belief, Merely because it ceases to be true, Cling to it long enough, and not a doubt, It will turn true again, for so it goes.
There is nothing makes a man suspect much, more than to know little, and therefore men should remedy suspicion by procuring to know more, and not keep their suspicions in smother.