The higher the classification of secrecy, the quicker you will report it.
Science is the systematic classification of experience.
Things which stimulate my curiosity are pretty far removed from the practical and therefore from classification.
Embryology furnishes, also, the best measure of true affinities existing between animals.
It is once again the vexing problem of identity within variety; without a solution to this disturbing problem there can be no system, no classification.
If you can play, you can play anything. I don't like classifications.
To be beyond any existing classification has always pleased me.
A classification is a definition comprising a system of definitions.