A scientist worthy of the name, above all a mathematician, experiences in his work the same impression as an artist; his pleasure is as great and of the same nature. ...we work not only to obtain the positive results which, according to the profane, constitute our one and only affection, as to experience this aesthetic emotion and to convey it to others who are capable of experiencing it.
"Notice sur Halphen," Journal de l'École Polytechnique (Paris, 1890)