As long as natural science is thinking, its development form is hypothesis. [Germany] Engels: "Selected Works of Engels"

No great discovery can be made without bold guesses. [English] Newton: "The Art of Scientific Research"

Hypothesis is the most important means of intellectual activity in research work. Its role is to point to new experiments and observations, thus sometimes leading to new discoveries, even when the hypothesis itself is incorrect. [Australia] Beveridge: "The Art of Scientific Research"

We must always be alert to the danger that once a hypothesis is formed, preferences may affect observation, interpretation and judgment, and "subjective wishes" may unknowingly occurs in. [Australia] Beveridge: "The Art of Scientific Research"

All concepts, doctrines, and systems, no matter how refined or solid they are, must be regarded as hypotheses, [Beauty] About? Dewey: " "The Transformation of Philosophy"

When a hypothesis is found to be unsatisfactory, scientists with rich imagination are more likely to give up on it than scientists with poor imagination. [Australia] Beveridge: "The Art of Scientific Research"

Hypothesis always precedes knowledge. [Germany] Humboldt

In a sense, it takes courage to propose hypotheses, because whether in mathematics or physics, most of the initially proposed hypotheses are unfeasible and ominous. [Japan] Hironaka Pingyou: "The Path of Academics"

Any progress is due to the acceptance of certain specialized hypotheses, that is, guesses about the environment or causes of certain effects in nature. Therefore, anyone who can freely imagine and combine various unrelated ideas is the bravest and most creative experimenter. [English] Prichtli

Generalizations, doctrines, hypotheses and theories are the soul of science. [Russian] Mendeleev: "The Third Letter About the Factory"

The value of the hypothesis lies in using the hypothesis as a basis to spread new directions of research work in all directions, and to spread this Hypotheses are applied to as many specific situations as possible. If the hypothesis is applicable to various situations, it can be elevated to the category of theory; if it is deep enough, it can even be elevated to a "law". [Australia] Beveridge: "The Art of Scientific Research"

A hypothesis develops into a theory only because it can explain a large number of facts. [English] Darwin: "Darwin's Life and Letters"

The astronomer's job is to make painstaking and skillful observations and studies of the history of the movements of the stars that come together. Because he could not accurately figure out the real cause of the movement, he imagined some reason or hypothesis that he thought was appropriate to explain it. [Bo] Copernicus: "On the Revolution of the Celestial Bodies"

In scientific inquiry... the explorer should start from the fact and seek the reasons for the fact or start from the hypothesis and seek the evidence for the hypothesis. [US] William James: "Principles of Psychology"

The sun will rise tomorrow, which is an assumption. That said, we don't know if it will come out. [Austria] Wittgenstein: "Tractatus Logico-Philosophica"

Reality does not always exactly match predictions.

〔A〕Borges: "The Secret Miracle"