War can only be abolished through war, and in order to get rid of the gun it is necessary to take up the gun.
Mao Zedong

There are two good rules which ought to be written on every heart - never to believe anything bad about anybody unless you positively know it to be true; never to tell even that unless you feel that it is absolutely necessary, and that God is listening.
Henry Van Dyke

For centuries the leaders of Christian thought spoke of women as a necessary evil, and the greatest saints of the Church are those who despise women the most.
Annie Besant

By far the greatest part of those goods which are the objects of desire, are procured by labour; and they may be multiplied, not in one country alone, but in many, almost without any assignable limit, if we are disposed to bestow the labour necessary to obtain them.
David Ricardo

If a commodity were in no way useful, - in other words, if it could in no way contribute to our gratification, - it would be destitute of exchangeable value, however scarce it might be, or whatever quantity of labour might be necessary to procure it.
David Ricardo

There may be as much nobility in being last as in being first, because the two positions are equally necessary in the world, the one to complement the other.
Jose Ortega y Gasset

A party of order or stability, and a party of progress or reform, are both necessary elements of a healthy state of political life.
John Stuart Mill

I am an optimist because I want to change things for the better and I know that blood has to be spilled and disharmony and cruelty are necessary to do that.
Henry Rollins

Not to unlearn what you have learned is the most necessary kind of learning.
Antisthenes

Useless laws weaken the necessary laws.
Charles de Montesquieu

Change is not merely necessary to life - it is life.
Alvin Toffler

The difference between a tool and a machine is not capable of very precise distinction; nor is it necessary, in a popular explanation of those terms, to limit very strictly their acceptation.
Charles Babbage

Whenever the work is itself light, it becomes necessary, in order to economize time, to increase the velocity.
Charles Babbage

Analyzing what you haven't got as well as what you have is a necessary ingredient of a career.
Orison Swett Marden

Analyzing what you haven't got as well as what you have is a necessary ingredient of a career.
Orison Swett Marden

You don't concentrate on risks. You concentrate on results. No risk is too great to prevent the necessary job from getting done.
Chuck Yeager

If we have reason to believe someone is preparing an attack against the U.S., has developed that capability, harbours those aspirations, then I think the U.S. is justified in dealing with that, if necessary, by military force.
Dick Cheney

We must be prepared to face our responsibilities and be willing to use force if necessary.
Dick Cheney

Everyone admits that love is wonderful and necessary, yet no one agrees on just what it is.
Diane Ackerman

How I wish we lived in a time when laws were not necessary to safeguard us from discrimination.
Barbra Streisand