“[A]ll things as subsist from nature appear to contain in themselves a principle of motion and permanency; some according to place, others according to increase and diminuation; and others according to change in quality.”
Book II, Ch. I, p. 88.
Physics
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Aristotle 230
Classical Greek philosopher, student of Plato and founder o… -384–-321 BCRelated quotes

As quoted by Diogenes Laërtius, in Lives of Eminent Philosophers: 'Zeno', 7.87.
The "end" here means “the goal of life.”

“To a rational being it is the same thing to act according to nature and according to reason.”
VII, 11
Meditations (c. 121–180 AD), Book VII

XVII. That the World is by nature Eternal.
On the Gods and the Cosmos

On Property (24 April 1793)

Kant's Inaugural Dissertation (1770), Section V On The Method Respecting The Sensuous And The Intellectual In Metaphysics

Gakumon no Susume [An Encouragement of Learning] (1872–1876).
Context: Each individual man and each individual country, according to the principles of natural reason, is free from bondage. Consequently, if there is some threat that might infringe upon a country’s freedom, then that country should not hesitate even to take up arms against all the countries of the world.

For My Legionaries: The Iron Guard (1936), Politics