An animal experiment cannot be justifiable unless the experiment is so important that the use of a brain-damaged human would be justifiable.

Unfortunately, where there is no experiment of exact science to settle the matter, it takes as much time and trouble to pull down a falsehood as to build up a truth.

Yesterday contains all the battlefields in which freedom was
gradually wrought out from many threads all dipped in blood.
Yesterday contains the experiment and the failure of all despotisms. Yesterday con tains the onset and defeat of every form
of sin and vice. Yesterday holds the ashes of all beauty, and
of all life except that of the soul with God. Yesterday is full of
past usefulness and of its ways and means, full of tears and
their causes and cures. In that shadowy domain there stands
the cross, and there is the Saviour dying for the vast myriads
of a race. God has not without reason thrown such an immense history behind His children of to-day. It must be that
out of the world that has been there is always flowing down
to those who are living a stream of wisdom and character that
bears onward to a sacred destiny.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

A theory is something nobody believes, except the person who made it. An experiment is something everybody believes, except the person who made it.

Development of Western science is based on two great achievements: the invention of the formal logical system (in Euclidean geometry) by the Greek philosophers, and the discovery of the possibility to find out causal relationships by systematic experiment (during the Renaissance). In my opinion, one has not to be astonished that the Chinese sages have not made these steps. The astonishing thing is that these discoveries were made at all.

Every time man makes a new experiment he always learns more. He cannot learn less. He may learn that what he thought was true was not true. By the elimination of a false premise, his basic capital wealth which in his given lifetime is disembarrassed of further preoccupation with considerations of how to employ a worthless time-consuming hypothesis. Freeing his time for its more effective exploratory investment is to give man increased wealth.

The procedure we are pursuing is that of true democracy. Semi-democracy accepts the dictatorship of a majority in establishing its arbitrary, ergo, unnatural, laws. True democracy discovers by patient experiment and unanimous acknowledgement what the laws of nature or universe may be for the physical support and metaphysical satisfaction of the human intellect's function in universe.

In the matter of physics, the first lessons should contain nothing but what is experimental and interesting to see. A pretty experiment is in itself often more valuable than twenty formulae extracted from our minds.

The sciences of observation and experiment are alike in this, that their aim is to detect the constant or recurring features in all events of a certain kind. A meteorologist studies one cyclone in order to compare it with others ; and by studying a number of them he hopes to find out what features in them are constant, that is, to find out what cyclones as such are like. But the historian has no such aim. If you find him on a certain occasion studying the Hundred Years War or the Revolution of 1688, you cannot infer that he is in the preliminary stages of an inquiry whose ultimate aim is to reach conclusions about wars or revolutions as such. If he is in the preliminary stages of any inquiry, it is more likely to be a general study of the Middle Ages or the seventeenth century. This is because the sciences of observation and experiment are organized in one way and history is organized in another. In the organization of meteorology, the ulterior value of what has been observed about one cyclone is conditioned by its relation to what has been observed about other cyclones. In the organization of history, the ulterior value of what is known about the Hundred Years War is conditioned, not by its relation to what is known about other wars, but by its relation to what is known about other things that people did in the Middle Ages.

You make experiments and I make theories. Do you know the difference? A theory is something nobody believes, except the person who made it. An experiment is something everybody believes, except the person who made it.

So blind is the curiosity by which mortals are possessed, that they often conduct their minds along unexplored routes, having no reason to hope for success, but merely being willing to risk the experiment of finding whether the truth they seek lies there.

There are no mistakes, only lessons. Growth is a process of trial and error: experimentation. The 'failed' experiments are as much a part of the process as the experiment that ultimately 'works.'

Whatever We Hold in Thought Comes True in Our Experience; Like Attracts Like; we experiment with the Law of Changing Appearances, to make our outer world reflect our inner.

Each piece, or part, of the whole nature is always an approximation to the complete truth, or the complete truth so far as we know it. In fact, everything we know is only some kind of approximation, because we know that we do not know all the laws as yet. Therefore, things must be learned only to be unlearned again or, more likely, to be corrected.... The test of all knowledge is experiment. Experiment is the sole judge of scientific truth.

In general we look for a new law by the following process. First we guess it. Then we compute the consequences of the guess to see what would be implied if this law that we guessed is right. Then we compare the result of the computation to nature, with experiment or experience, compare it directly with observation, to see if it works. If it disagrees with experiment it is wrong. In that simple statement is the key to science. It does not make any difference how beautiful your guess is. It does not make any difference how smart you are, who made the guess, or what his name is

We've learned from experience that the truth will come out. Other experimenters will repeat your experiment and find out whether you were wrong or right. Nature's phenomena will agree or they'll disagree with your theory. And, although you may gain some temporary fame and excitement, you will not gain a good reputation as a scientist if you haven't tried to be very careful in this kind of work. And it's this type of integrity, this kind of care not to fool yourself, that is missing to a large extent in much of the research in cargo cult science.

That is all there is to it. No doubts, no discussion of earlier affairs, no to-ing and fro-ing, no physical experiment beyond a kiss, none of the complex voodoo which is thought necessary in even the most perfunctory modern novel to clap two ninnies together.

When we’re dancing, the struggle is gone.

An instinct is an urge inherent in organic life to restore an earlier state of things