In God alone, essence (what He is) and existence (that he is) coincide.
AVICENNANow it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials.
More Avicenna Quotes
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The different sorts of madness are innumerable.
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Those who deny the first principle should be flogged or burned until they admit that it is not the same thing to be burned and not burned, or whipped and not whipped.
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The more brilliant the lightning, the quicker it disappears.
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As to the mental essence, we find it in infants devoid of every mental form.
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Is it the fault of wine if a fool drinks it and goes stumbling into darkness?
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The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.
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Medicine considers the human body as to the means by which it is cured and by which it is driven away from health.
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I [prefer] a short life with width to a narrow one with length.
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A horse is simply a horse.
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Leeches should be kept a day before applying them. They should be squeezed to make them eject the contents of their stomachs.
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An ignorant doctor is the aide-de-camp of death.
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Width of life is more important than length of life.
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It is in the nature of water … to become transformed into earth through a predominating earthy virtue; … it is in the nature of earth to become transformed into water through a predominating aqueous virtue.
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There are no incurable diseases – only the lack of will. There are no worthless herbs – only the lack of knowledge.
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Now it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials.
AVICENNA