When friends stop being frank and useful to each other, the whole world loses some of its radiance.

- Anatole Broyard

The problem of distinguishing prime numbers from composite numbers and of resolving the latter into their prime factors is known to be one of the most important and useful in arithmetic.

- Carl Friedrich Gauss

What they are doing is taking something that otherwise creates pollution and turning it into something useful.

- Barbara Lee

I am extremely honoured to be the Defence Secretary, and I would not do the job if I did not think that I could make a useful contribution in the role.

- Bob Ainsworth

I don't think it's useful for somebody to argue with reviews.

- Bob Woodward

I don't give interviews on Chanel because it is not useful for the Chanel business.

- Alain Wertheimer

The most useful piece of learning for the uses of life is to unlearn what is untrue.

- Antisthenes

I lived in Shetland for a short while in the seventies and have been visiting ever since, so I have lots of useful contacts!

- Ann Cleeves

Any place that anyone can learn something useful from someone with experience is an educational institution.

- Al Capp

Self-pity is never useful. It tends to distort like a fun-house mirror.

- Anne Roiphe

My interest in creating anything is that it be useful.

- Alice Walker

The more questions and answers we get, the more useful Quora is.

- Adam D'Angelo

I aspire to be useful.

- Anthony Foxx

Sometimes when you're going fast, your instincts can be very useful.

- Andrea Arnold

I believe that a man can only be useful to his country when he can look at it clearly.

- Adam Michnik

Where would we be without inhibitions? They're quite useful things when you look at some of the things humans do if they lose them.

- A. S. Byatt

It's very useful when politicians have doubts because there are so many choices to be made in the world.

- Antonio Tabucchi

The world forgets about people who are not useful.

- Alain Ducasse

The greatest virtues are those which are most useful to other persons.

- Aristotle

The Pulitzer is more useful than meaningful.

- Annie Dillard