Natural forces are measurable only in the form in which we know them, and the measure of their effect is energy.

Whoever, in the pursuit of science, seeks after immediate practical utility may rest assured that he seeks in vain.

The originator of a new concept finds, as a rule, that it is much more difficult to find out why other people do not understand him than it was to discover the new truth.

You must learn all things: both the steadfast heart of well-rounded Truth and the opinions of mortals, in which there is no true trust.

-- Parmenides

For thinking and Being are the same.

-- Parmenides

Those who understand that things arise dependently know them to be empty.

-- Nagarjuna

Knowing is the beginning of action; action is the completion of knowing.

-- Wang Yangming

The world is my representation.

-- Arthur Schopenhauer

Knowledge is the conformity of the object and the intellect.

-- Averroes