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" The one exclusive sign of thorough knowledge is the power of teaching. "

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" Both oligarch and tyrant mistrust the people, and therefore deprive them of their arms. "

" Probable impossibilities are to be preferred to improbable possibilities. "

" For as the eyes of bats are to the blaze of day, so is the reason in our soul to the things which are by nature most evident of all. "

" The duty of rhetoric is to deal with such matters as we deliberate upon without arts or systems to guide us, in the hearing of persons who cannot take in at a glance a complicated argument or follow a long chain of reasoning. "

" Piety requires us to honor truth above our friends. "

" Even when laws have been written down, they ought not always to remain unaltered. "

" The state comes into existence for the sake of life and continues to exist for the sake of good life. "

" The soul never thinks without a picture. "

" Beware of false knowledge; it is more dangerous than ignorance. "

George Bernard Shaw

" Our judgments when we are pleased and friendly are not the same as when we are pained and hostile. "

" The roots of education are bitter, but the fruit is sweet. "

" Poetry is finer and more philosophical than history; for poetry expresses the universal, and history only the particular. "

" All men by nature desire knowledge. "

" Friendship is essentially a partnership. "

" Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity. "

Leonardo da Vinci

" No one loves the man whom he fears. "

" In making a speech one must study three points: first, the means of producing persuasion; second, the language; third the proper arrangement of the various parts of the speech. "

" The wise man does not expose himself needlessly to danger, since there are few things for which he cares sufficiently; but he is willing, in great crises, to give even his life - knowing that under certain conditions it is not worthwhile to live. "

" Republics decline into democracies and democracies degenerate into despotisms. "

" Knowledge is the eye of desire and can become the pilot of the soul. "

" The eyes of some persons are large, others small, and others of a moderate size; the last-mentioned are the best. And some eyes are projecting, some deep-set, and some moderate, and those which are deep-set have the most acute vision in all animals; the middle position is a sign of the best disposition. "

" Those who excel in virtue have the best right of all to rebel, but then they are of all men the least inclined to do so. "

" Democracy arises out of the notion that those who are equal in any respect are equal in all respects; because men are equally free, they claim to be absolutely equal. "

" Knowledge is the treasure of a wise man. "

" The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others. "

" He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god. "

" Persuasion is achieved by the speaker's personal character when the speech is so spoken as to make us think him credible. We believe good men more fully and more readily than others: this is true generally whatever the question is, and absolutely true where exact certainty is impossible and opinions are divided. "

" Hope is a waking dream. "

" Electrical science has revealed to us the true nature of light, has provided us with innumerable appliances and instruments of precision, and has thereby vastly added to the exactness of our knowledge. "

" Suffering becomes beautiful when anyone bears great calamities with cheerfulness, not through insensibility but through greatness of mind. "