The proper Science and Subject for Man's Contemplation is Man himself.
La vraie science et le vrai étude de l'homme c'est l'homme.
Original text (French)
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Source, in full
Book I, Ch. 1. Stanhope's translation, reported in Hoyt's New Cyclopedia of Practical Quotations (1922) p. 488. Different translation in H. L. Mencken (ed.) A New Dictionary of Quotations on Historical Principles ([1942] 1960) p. 739: "The true science and study of man is man."