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.
A vocation makes us unthinking; that is its greatest blessing. For it is a bulwark behind which we are permitted to withdraw whencommonplace doubts and cares assail us.
Suspicions that the mind, of itself, gathers, are but buzzes; but suspicions that are artificially nourished and put into men's heads by the tales and whisperings of others, have stings.
Given the millions of billions of Earth-like planets, life elsewhere in the Universe without a doubt, does exist. In the vastness of the Universe we are not alone.
you must be careful never to allow doubt to paralyze you. always take the decisions you need to take, even if you're not sure you're doing the right thing. You'll never go wrong if, when you make a decision, you keep in mind an old German proverb: 'The devil is in the detail.' Remember that proverb and you'll always be able to turn a wrong decision into a right one.
A lui la foi, a' elle le doute, a' elle le fardeau le plus lourd: la femme ne souffre-t-elle pas toujours pour deux? For him, faith; for her, doubt and for her theheavier load: does not the woman always suffer for both?