A body in motion tends to stay in motion unless acted on by an outside force.
Philosophy is such an impertinently litigious lady that a man had as good be engaged in lawsuits as have to do with her.
The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.
For the Rays, to speak properly, have no Colour. In them there is nothing else than a certain power and disposition to stir up a sensation of this Colour or that.
Therefore to the same natural effects we must, as far as possible, assign the same causes.
By such deductions the law of gravitation is rendered probable, that every particle attracts every other particle with a force which varies inversely as the square of the distance. The law thus suggested is assumed to be universally true.
Hypotheses non fingo. I frame no hypotheses.
Against filling the Heavens with fluid Mediums, unless they be exceeding rare, a great Objection arises from the regular and very lasting Motions of the Planets and Comets in all manner of Courses through the Heavens.
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.
Centripetal force is the force by which bodies are drawn from all sides, are impelled, or in any way tend, toward some point as to a center.
Where both are friends, it is right to prefer truth.
A cylinder of air reaching to the top of the atmosphere is of equal weight with a cylinder of water about 33 feet high.
The Ignis Fatuus is a vapor shining without heat.
No sciences are better attested than the religion of the Bible.
All my discoveries have been made in answer to prayer.
God is able to create particles of matter of several sizes and figures and perhaps of different densities and forces, and thereby to vary the laws of nature, and make worlds of several sorts in several parts of the Universe.
Physics, beware of metaphysics.
All the characters of the Passion agree to the year 34; and that is the only year to which they all agree.
To arrive at the simplest truth requires years of contemplation.
An object that is at rest will tend to stay at rest. An object that is in motion will tend to stay in motion.