There is no royal road to geometry.
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Reply given when the ruler Ptolemy I Soter asked Euclid if there was a shorter road to learning geometry than through Euclid's Elements.
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Proclus (412–485 AD) in Commentary on the First Book of Euclid's Elements as translated by Glenn R. Morrow (1970), p. 57.Euclid
There is no royal road to learning; no short cut to the acquirement of any art.
Anthony Trollope
The interpretation of dreams is the royal road to a knowledge of the unconscious activities of the mind.
Sigmund Freud
The concept of congruence in Euclidean geometry is not exactly the same as that in non-Euclidean geometry. ..."Congruent" means in Euclidean geometry the same as "determining parallelism," a meaning which it does not have in non-Euclidean geometry.
Hans Reichenbach
It is a happy thing that there is no royal road to poetry. The world should know by this time that one cannot reach Parnassus except by flying thither.
Gerard Manley Hopkins
Justice, I think, is the tolerable accomodation of the conflicting interests of society, and I don't believe there is any royal road to attain such accomodations concretely.
Learned Hand
Euclid
Euler, Leonhard
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