The true worth of an experimenter consists in his pursuing not only what he seeks in his experiment, but also what he did not seek.

Observation is a passive science, experimentation an active science.

Man can learn nothing except by going from the known to the unknown.

In teaching man, experimental science results in lessening his pride more and more by proving to him every day that primary causes, like the objective reality of things, will be hidden from him forever and that he can only know relations.

The true worth of an experimenter consists in his pursuing not only what he seeks in his experiment, but also what he did not seek.

Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave.

Mediocre men often have the most acquired knowledge.

Experimentation is an active science.

A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.

Art is I; science is we.

It is what we know already that often prevents us from learning.

The experimenter who does not know what he is looking for will not understand what he finds.

Science does not permit exceptions.

The investigator should have a robust faith - and yet not believe.

The stability of the internal medium is a primary condition for the freedom and independence of certain living bodies in relation to the environment surrounding them.

We must alter theory to adapt it to nature, but not nature to adapt it to theory.

Almost everyone will find something in our services worth paying for.

What an artist learns matters little. What he himself discovers has a real worth for him, and gives him the necessary incitement to work.

A true critic ought to dwell upon excellencies rather than imperfections, to discover the concealed beauties of a writer, and communicate to the world such things as are worth their observation.

What a year to live in! Worth all other times ever known in our history or any other.

Good habits are worth being fanatical about.

A minute of perfection was worth the effort. A moment was the most you could ever expect from perfection.

No civilization other than that which is Christian, is worth seeking or possessing.

Writing is a dog's life, but the only life worth living.

A good novel is worth more then the best scientific study.

Every day some new fact comes to light - some new obstacle which threatens the gravest obstruction. I suppose this is the reason which makes the game so well worth playing.

Then I found books that were written much later, as late as 15 years ago. It was very superficial material, but enough to tell me that the genesis of this story was worth exploring.

The situation in Iraq will be long, it will be expensive and it will be difficult. But in the end, Iraq will very much be worth it.

I think the Space Shuttle is worth one billion dollars a launch. I think that it is worth two billion dollars for what it does. I think the Shuttle is worth it for the work it does.

I won't apologize for ticket prices. I think we're well worth it. We consider ourselves in the elite touring acts, like the Stones, Elton John, Paul McCartney.

A book is worth a few francs; we Germans can afford to destroy those. We all may not appreciate artistic merit, but cash value is another matter.

That would be getting up at 5 am... I don't understand why film's shoot such brutal hours. I think it'd be worth it to not be so strictly cost-effective and have an 8 hour day. The film's would benefit in the end.

By the time a bartender knows what drink a man will have before he orders, there is little else about him worth knowing.

I've been careful to keep my life separate because it's important to me to have privacy and for my life not to be a marketing device for a movie or a TV show. I'm worth more than that.

The secret of the truly successful, I believe, is that they learned very early in life how not to be busy. They saw through that adage, repeated to me so often in childhood, that anything worth doing is worth doing well.

No I haven't and all I can say is that if it's cost $600,000, I hope we get $600,000 worth of value out of it.

A book worth reading is worth buying.

In short, our response as a party should be to work to solve the crises that produce crisis pregnancies, and work to make life worth living for mother and child, rather than victimize the child as a way of dealing with the crisis.

Hype is the awkward and desperate attempt to convince journalists that what you've made is worth the misery of having to review it.

This life is worth living, we can say, since it is what we make it.

One of the secrets of life is that all that is really worth the doing is what we do for others.

It's a terribly hard job to spend a billion dollars and get your money's worth.

If you live a life of make-believe, your life isn't worth anything until you do something that does challenge your reality. And to me, sailing the open ocean is a real challenge, because it's life or death.

I enjoy convalescence. It is the part that makes the illness worth while.

Great art is never produced for its own sake. It is too difficult to be worth the effort.

It's really not that hard. If I do a Tonight Show, it's six or seven minutes. If I do a concert, it's 90 minutes. If I do an interview, that's 15 minutes. So by the end of the day I've done three hours worth of work.

For athletes, the Olympics are the ultimate test of their worth.

One thorn of experience is worth a whole wilderness of warning.

Most people know no other way of judging men's worth but by the vogue they are in, or the fortunes they have met with.