Oh Diamond! Diamond! thou little knowest the mischief done! [Apocryphal]

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

What Descartes did was a good step. You have added much several ways, and especially in taking the colours of thin plates into philosophical consideration. If I have seen a little further it is by standing on the shoulders of Giants.

Sir Isaac Newton was asked how he discovered the law of gravity. He replied, "By thinking about it all the time.

My powers are ordinary. Only my application brings me success.

Physics, beware of metaphysics.

As in Mathematicks, so in Natural Philosophy, the Investigation of difficult Things by the Method of Analysis, ought ever to precede the Method of Composition. This Analysis consists in making Experiments and Observations, and in drawing general Conclusions from them by Induction, and admitting of no Objections against the Conclusions, but such as are taken from Experiments, or other certain Truths. For Hypotheses are not to be regarded in experimental Philosophy.