As seen above, special emphasis was laid by Xenophon upon natural resources as an element in production, both in land and in the mines. His great interest in and eulogy of agriculture as the basal industry, upon which all other sources of wealth depend,[409] have caused him to be classed with the physiocrats of modern time but such an interpretation is hardly warranted. Without doubt, agriculture is, in his opinion, the supremely honorable occupation. It shares with war the right to be placed above all other vocations.[410] It permits the maximum of leisure and physical development, and is not unworthy of the personal attention of a prince.[411] It is the most pleasant, most productive,, most dignified, of callings; the best exercise for the athlete, the finest school for education in patriotism and justice, and it offers the greatest opportunity for the exercise of hospitality to men and reverence to gods.[412] Indeed, it is the first of all occupations for an honorable and high-minded man to choose.[413] Here we have the highest eulogy of agriculture in Greek literature. It is in essence a sound statement, and offers a needed message for today. Though Xenophon recognized the practical importance of capital in industrial enterprises,[414] he developed no theory of it in his writings. He appreciated, however, the value of being able to keep a surplus.[415] The term ἀφορμή, as used by him of the provision of raw material for weaving, probably signified nothing more than it would have done to any Athenian business man of his time.[416] The word originally meant a “starting-point,” especially in war.[417] Later, it signified the “means” or “resources” with which one begins a project,[418] especially in business. It was an easy step from this general business use to the meaning, “financial capital” of a banker.[419] Other terms for capital were ἐνεργά, used of interest-bearing capital in antithesis to ἀργά, of goods merely for use;[420] κάρπιμα, “goods that yield a produce,” as opposed to ἀπολαυστικά, “goods to be enjoyed,”[421] which is suggestive of Mill’s[422] definition, “that part of his possessions ... which he designs to employ in carrying on fresh production,” and of his two kinds of capital, “circulating” and “fixed”; ποιητικά, “things for further production,” as opposed to πρακτικά, “things merely for use”;[423] κεφάλαιος, of capital as opposed to interest or income.[424] The term ἔρανος, also, since it came to mean a “contribution of money,” was often used of a loan, and therefore approached the signification of “money capital.”[425]