In God alone, essence (what He is) and existence (that he is) coincide.
AVICENNAThe knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.
More Avicenna Quotes
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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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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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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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When you do not know the nature of the malady, leave it to nature; do not strive to hasten matters. For either nature will bring about the cure or it will itself reveal clearly what the malady really is.
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That whose existence is necessary must necessarily be one essence.
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A horse is simply a horse.
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The different sorts of madness are innumerable.
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As to the mental essence, we find it in infants devoid of every mental form.
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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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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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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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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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I [prefer] a short life with width to a narrow one with length.
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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