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Knowing is not enough; we must apply. Being willing is not enough; we must do.

— Leonardo da Vinci Disputed

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Source and credibility

Wikiquote notes doubts about whether Leonardo da Vinci really said this.

Source: No published occurrence of such an attribution has yet been located prior to one in Wilhelm Meisters Wanderjahre — Band 3 by Johann Wolfgang von Goethe
Source quality: Source identified Names the work or year, but without an exact location.

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Fire is to represent truth because it destroys all sophistry and lies; and the mask is for lying and falsehood which conceal truth.

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The boundaries of bodies are the least of all things.

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A picture or representation of human figures, ought to be done in such a way as that the spectator may easily recognise, by means of their attitudes, the purpose in their minds.

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Let no man who is not a Mathematician read the elements of my work.

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It is easier to contend with evil at the first than at the last.

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What is fair in men, passes away, but not so in art.

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Men will seem to see new destructions in the sky.

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Notes from Wikiquote

Es ist nicht genug, zu wissen, man muß auch anwenden; es ist nicht genug, zu wollen, man muß auch tun.

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Things that are separate shall be united and acquire such virtue that they will restore to man his lost memory.

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Of the horse I will say nothing because I know the times.

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Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass, though but slowly.

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Drawing is based upon perspective, which is nothing else than a thorough knowledge of the function of the eye.

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Animals will be seen on the earth who will always be fighting against each other with the greatest loss and frequent deaths on each side.

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Attribution

Quote text and notes from Wikiquote: Leonardo da Vinci (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.