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

I like nonsense, it wakes up the brain cells. Fantasy is a necessary ingredient in living, it's a way of looking at life through the wrong end of a telescope. Which is what I do, and that enables you to laugh at life's realities.
Dr. Seuss

All intelligent thoughts have already been thought; what is necessary is only to try to think them again.
Johann Wolfgang von Goethe

For an occurrence to become an adventure, it is necessary and sufficient for one to recount it.
Jean-Paul Sartre

To copy others is necessary, but to copy oneself is pathetic.
Pablo Picasso

Preach the Gospel at all times and when necessary use words.
Francis of Assisi

Certain defects are necessary for the existence of individuality.
Johann Wolfgang von Goethe

To gather with God's people in united adoration of the Father is as necessary to the Christian life as prayer.
Martin Luther

Although nature commences with reason and ends in experience it is necessary for us to do the opposite, that is to commence with experience and from this to proceed to investigate the reason.
Leonardo da Vinci

In order to exist just once in the world, it is necessary never again to exist.
Albert Camus

It isn't necessary to have relatives in Kansas City in order to be unhappy.
Groucho Marx

Consumption is the sole end and purpose of all production; and the interest of the producer ought to be attended to, only so far as it may be necessary for promoting that of the consumer.
Adam Smith

Poor David Hume is dying fast, but with more real cheerfulness and good humor and with more real resignation to the necessary course of things, than any whining Christian ever dyed with pretended resignation to the will of God.
Adam Smith

Man needs difficulties; they are necessary for health.
Carl Jung

One looks back with appreciation to the brilliant teachers, but with gratitude to those who touched our human feelings. The curriculum is so much necessary raw material, but warmth is the vital element for the growing plant and for the soul of the child.
Carl Jung

Dreams are necessary to life.
Anais Nin

There are necessary evils. Money is an important thing in terms of representing freedom in our world. And now I have a daughter to think about. It's really the first time I've thought about the future and what it could be.
Johnny Depp

The great work must inevitably be obscure, except to the very few, to those who like the author himself are initiated into the mysteries. Communication then is secondary: it is perpetuation which is important. For this only one good reader is necessary.
Henry Miller

It is necessary to the happiness of man that he be mentally faithful to himself. Infidelity does not consist in believing, or in disbelieving, it consists in professing to believe what he does not believe.
Thomas Paine

Society in every state is a blessing, but government, even in its best stage, is but a necessary evil; in its worst state an intolerable one.
Thomas Paine