“Hypotheses non fingo. I frame no hypotheses.”

To arrive at the simplest truth requires years of contemplation.

Hypotheses should be subservient only in explaining the properties of things but not assumed in determining them, unless so far as they may furnish experiments.

The moon gravitates towards the earth and by the force of gravity is continually drawn off from a rectilinear motion and retained in its orbit.

We account the Scriptures of God to be the most sublime philosophy.

Therefore, the causes assigned to natural effects of the same kind must be, so far as possible, the same.

Physics, beware of metaphysics.

I feign no hypotheses.

Atheism is so senseless and odious to mankind that it never had many professors.

My principal method for defeating error and heresy is by establishing the truth. One purposes to fill a bushel with tares, but if I can fill it first with wheat, I may defy his attempts.

Truth is ever to be found in the simplicity, and not in the multiplicity and confusion of things.

I keep the subject of my inquiry constantly before me, and wait till the first dawning opens gradually, by little and little, into a full and clear light.

The way to chastity is not to struggle directly with incontinent thoughts but to avert the thoughts by some imployment, or by reading, or meditating on other things.

The more time and devotion one spends in the worship of false gods, the less he is able to spend in that of the true One.

It is reasonable that forces directed toward bodies depend on the nature and the quantity of matter of such bodies, as happens in the case of magnetic bodies.

The instinct of brutes and insects can be the effect of nothing else than the wisdom and skill of a powerful ever-living agent.

No great discovery was ever made without a bold guess.

The rate of change of scientific hypothesis is naturally much more rapid than that of Biblical interpretations, so that if an interpretation is founded on such an hypothesis, it may help to keep the hypothesis above ground long after it ought to be buried and forgotten.

The whole edifice of modern physics is built up on the fundamental hypothesis of the atomic or molecular constitution of matter.

Is evolution a theory, a system, or an hypothesis? It is much more: it is a general condition to which all theories, all hypotheses, all systems must bow and which they must satisfy henceforward if they are to be thinkable and true.

We know that communism is the right hypothesis.

But if you consider how abnormal their behavior is, then you are led to the hypothesis that almost all men are suffering from ‘testosterone poisoning.’

All those who abandon this hypothesis immediately resign themselves to the market economy, to parliamentary democracy-the form of state suited to capitalism-and to the inevitable and ‘natural’ character of the most monstrous inequalities.

And affords the only secure ground on which the truth or falsehood of the theories and hypotheses of that complicated science can be brought to the test.

God is not a hypothesis derived from logical assumptions, but an immediate insight, self-evident as light. He is not something to be sought in the darkness with the light of reason. He is the light.