The product of mental labor - science - always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.
Karl Marx

In politics it is necessary either to betray one's country or the electorate. I prefer to betray the electorate.
Charles de Gaulle

If there were no God, it would be necessary to invent him.
Voltaire

If God did not exist, it would be necessary to invent Him.
Voltaire

The superfluous, a very necessary thing.
Voltaire

This self-love is the instrument of our preservation; it resembles the provision for the perpetuity of mankind: it is necessary, it is dear to us, it gives us pleasure, and we must conceal it.
Voltaire

An intellectual is a man who takes more words than necessary to tell more than he knows.
Dwight D. Eisenhower

The United Nations organization has proclaimed 1979 as the Year of the Child. Are the children to receive the arms race from us as a necessary inheritance?
Pope John Paul II

Without contraries is no progression. Attraction and repulsion, reason and energy, love and hate, are necessary to human existence.
William Blake

It is necessary for him who lays out a state and arranges laws for it to presuppose that all men are evil and that they are always going to act according to the wickedness of their spirits whenever they have free scope.
Niccolo Machiavelli

War is just when it is necessary; arms are permissible when there is no hope except in arms.
Niccolo Machiavelli

If men were angels, no government would be necessary.
James Madison

What is government itself but the greatest of all reflections on human nature? If men were angels, no government would be necessary. If angels were to govern men, neither external nor internal controls on government would be necessary.
James Madison

I don't believe in team motivation. I believe in getting a team prepared so it knows it will have the necessary confidence when it steps on a field and be prepared to play a good game.
Tom Landry

Perfect freedom is as necessary to the health and vigor of commerce as it is to the health and vigor of citizenship.
Patrick Henry

To survive it is often necessary to fight and to fight you have to dirty yourself.
George Orwell

Instead of stubbornly attempting to use surrealism for purposes of subversion, it is necessary to try to make of surrealism something as solid, complete and classic as the works of museums.
Salvador Dali

Do you not see how necessary a world of pains and troubles is to school an intelligence and make it a soul?
John Keats

Don't flatter yourself that friendship authorizes you to say disagreeable things to your intimates. The nearer you come into relation with a person, the more necessary do tact and courtesy become.
Oliver Wendell Holmes

History suggests that capitalism is a necessary condition for political freedom. Clearly it is not a sufficient condition.
Milton Friedman