A civilized society is one which tolerates eccentricity to the point of doubtful sanity.
Robert Frost

A doubtful friend is worse than a certain enemy. Let a man be one thing or the other, and we then know how to meet him.
Aesop

All those who offer an opinion on any doubtful point should first clear their minds of every sentiment of dislike, friendship, anger or pity.
Sallust

All who consult on doubtful matters, should be void of hatred, friendship, anger, and pity.
Sallust

Although a skillful flatterer is a most delightful companion if you have him all to yourself, his taste becomes very doubtful when he takes to complimenting other people.
Charles Dickens

And we've become very doubtful of our information sources, because they're all controlled by these huge multilateral corporations.
Brian De Palma

Are we a Christian nation now? It's doubtful. But did we start out as one? Without question.
Pat Robertson

Beware prejudices. They are like rats, and men's minds are like traps; prejudices get in easily, but it is doubtful if they ever get out.
Lord Jeffrey

For the last half of my life I have had the doubtful benefit of a brother whose literary reputation is much greater than my own.
Laurence Housman

I cannot explain it; but when difficulties arise, I am not perplexed or doubtful. I know how to meet them.
Anne Sullivan Macy

I knew it to be very doubtful whether the Cabinet, Parliament, and the country would take this view on the outbreak of war, and through the whole of this week I had in view the probable contingency that we should not decide at the critical moment to support France.
Edward Grey

I put forward formless and unresolved notions, as do those who publish doubtful questions to debate in the schools, not to establish the truth but to seek it.
Michel de Montaigne

I think people really marry far too much; it is such a lottery after all, and for a poor woman a very doubtful happiness.
Queen Victoria

I was a little doubtful about the propriety of going to the Mammoth Cave without a gentleman escort, but if two ladies travel alone they must have the courage of men.
Maria Mitchell

In doubtful cases the more liberal interpretation must always be preferred.
Marcus Tullius Cicero

In necessary things, unity; in doubtful things, liberty; in all things, charity.
Anne Baxter

In these days, it is doubtful that any child may reasonably be expected to succeed in life if he is denied the opportunity of an education.
Earl Warren

Increasingly, stars are recruited from the ranks of professional models, with the result that today's starlets are better dressed and better groomed than ever before, though it is doubtful if they are better actresses.
Rita Hayworth

It may be doubtful, at first, whether a person is an enemy or friend. Meat, if not properly digested, becomes poison; But poison, if used rightly, may turn medicinal.
Saskya Pandita

Life is like music, it must be composed by ear, feeling and instinct, not by rule. Nevertheless one had better know the rules, for they sometimes guide in doubtful cases, though not often.
Philipus Aureolus Paracelsus