„We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.“

— Isaac Newton

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„So much, then, my friends, is done, in the common and established course of nature, for the welfare of our children. Nature supplies a perennial force, unexhausted, inexhaustible, re-appearing whenever and wherever the parental relation exists. We, then, who are engaged in the sacred cause of education, are entitled to look upon all parents as having given hostages to our cause; and, just as soon as we can make them see the true relation in which they and their children stand to this cause, they will become advocates for its advancement, more ardent and devoted than ourselves.“
— Horace Mann
„The nature of the universe is the nature of things that are. Now, things that are have kinship with things that are from the beginning. Further, this nature is styled Truth; and it is the first cause of all that is true.“
— Marcus Aurelius
„A respectable appearance is sufficient to make people more interested in your soul“
— Karl Lagerfeld
„Reason may be employed in two ways to establish a point: firstly, for the purpose of furnishing sufficient proof of some principle, as in natural science, where sufficient proof can be brought to show that the movement of the heavens is always of uniform velocity. Reason is employed in another way, not as furnishing a sufficient proof of a principle, but as confirming an already established principle, by showing the congruity of its results, as in astrology the theory of eccentrics and epicycles is considered as established, because thereby the sensible appearances of the heavenly movements can be explained; not, however, as if this proof were sufficient, forasmuch as some other theory might explain them.“
— Thomas Aquinas