Truth in science can be defined as the working hypothesis best suited to open the way to the next better one.

It is a good morning exercise for a research scientist to discard a pet hypothesis every day before breakfast. It keeps him young.

Historians will have to face the fact that natural selection determined the evolution of cultures in the same manner as it did that of species.

Every man gets a narrower and narrower field of knowledge in which he must be an expert in order to compete with other people. The specialist knows more and more about less and less and finally knows everything about nothing.

I have found the missing link between the higher ape and civilized man; it is we.

We do not take humor seriously enough.

Evil, by definition, is that which endangers the good, and the good is what we perceive as a value.

We had better dispense with the personification of evil, because it leads, all too easily, to the most dangerous kind of war: religious war.

Most of the vices and mortal sins condemned today correspond to inclinations that were purely adaptive or at least harmless in primitive man.

Truth in science can be defined as the working hypothesis best suited to open the way to the next better one.

I believe that present day civilized man suffers from insufficient discharge of his aggressive drive.

Barking dogs occasionally bite, but laughing men hardly ever shoot.

The bond with a true dog is as lasting as the ties of this earth will ever be.

'I don't need brains,' says the billionaire contemptuously. 'I'm brainy enough myself!' The broker cries out in desperation, 'What, in heaven's name, do you want?' 'Goodness,' is the answer.

Ethologists are often accused of drawing false analogies between animal and human behaviour. However, no such thing as a false analogy exists: an analogy can be more or less detailed and, hence, more or less informative.

From a neighbour, I got a one-day-old duckling and found, to my intense joy, that it transferred its following response to my person. At the same time, my interest became irreversibly fixated on water fowl, and I became an expert on their behaviour even as a child.

I consider early childhood events as most essential to a man's scientific and philosophical development.

I grew up in the large house and the larger garden of my parents in Altenberg. They were supremely tolerant of my inordinate love for animals.

I owe undying gratitude to my patient parents.

In the course of evolution, it constantly happens that, independently of each other, two different forms of life take similar, parallel paths in adapting themselves to the same external circumstances.

Practically all animals which move fast in a homogeneous medium have found means of giving their body a streamlined shape, thereby reducing friction to a minimum.

The father-mother family with two children isolated in a city flat is already insufficient.

There is indeed the possibility that the evolutionary process has, in gray antiquity, bred into us an excess of aggression.

When I was about ten, I discovered evolution by reading a book by Wilhelm Boelsche and seeing a picture of Archaeopteryx.

Whenever we find, in two forms of life that are unrelated to each other, a similarity of form or of behaviour patterns which relates to more than a few minor details, we assume it to be caused by parallel adaptation to the same life-preserving function.

The human mind in taking us down the path of technocracy has become the adversary of life itself and collaterally the adversary of the human soul.

Man has been driven out of the paradise in which he could trust his instincts.

The cat is a wild animal that inhabits the homes of humans.

The bond with a dog is as lasting as the ties of this earth can ever be

Sometimes life's so much cooler when you just don't know any better and all the painful lessons have not hammered your head open yet.

I am a very open, social, friendly person, and when it comes to people approaching me and asking for an autograph, I am totally cool with doing any of that. It's a lot of fun.

We Finns represent a very transparent and open-minded way of reaching political decisions.

Life is intrinsically, well, boring and dangerous at the same time. At any given moment the floor may open up. Of course, it almost never does; that's what makes it so boring.

Slovakia's joining the OECD in 1999 is totally dependent on meeting economic reforms required such as transparency and legislation that permits fair and open conduct of trade and business.

What I have learned from my work up to now, is to try to be open, but also protect myself by not letting the good and the evil get too much importance.

So the thing that's beautiful about the Rolleiflex is that I open the camera up from the top and put my face in and that the camera's all about composition and all about light.

I am a camera with its shutter open, quite passive, recording, not thinking.

Doorman - a genius who can open the door of your car with one hand, help you in with the other, and still have one left for the tip.

I would never jeopardize classified information to be brought out to the public. This information is all open source. There is no reason to worry about classification. It is simply an attempt by bureaucrats to cover their rear ends.

Our aristocracy, unlike that of Europe, is open to all comers.

And when you see it the first time you put the film together, the roughest cut, is when you want to go home and open up your veins and get in a warm tub and just go away. And then it gradually, maybe, works its way back, somewhere toward that spot you were at before.

I like to think the price I paid by being open about my private life helped.

We did a different show every night. We'd open a show, and then two weeks later we'd open the next show. And two weeks later we'd open the third show until we had all eight running. And it was just one of the richest experiences I'd ever had in my theatrical life.

I'm open to getting more equipment, but I really won't have time to look into that until after the tour.

A great department store, easily reached, open at all hours, is more like a good museum of art than any of the museums we have yet established.

Fancy your having no sunshine in London yesterday! Here it was glorious, like full summer, and I sat up with the window wide open, listening to the discourse of two amorous thrushes.

I have a very open line of communication with both my children.

To play a good guy is nice because in a way, he is so open for answers.

If it wasn't for Abe Lincoln, I'd still be on the open market.