With kine and horses, Kurnus! we proceed By reasonable rules, and choose a breed For profit and increase at any price: Of a sound stock, without defect or vice. But, in the daily matches that we make, The price is everything: for money's sake, Men marry: women are in marriage given The churl or ruffian, that in wealth has thriven, May match his offspring with the proudest race: Thus everything is mix'd, noble and base! If then in outward manner, form, and mind, You find us a degraded, motley kind, Wonder no more, my friend! the cause is plain, And to lament the consequence is vain.
(The Works of J. Hookham Frere, vol. ii., 1872, p. 334.)
Note the hypocrisy above. Darwin decries his own behavior of marrying for money.
You seem to have missed the introduction to that paragraph:
The Grecian poet, Theognis, who lived 550 B. C., clearly saw how important selection, if carefully applied, would be for the improvement of mankind. He saw, likewise, that wealth often checks the proper action of sexual selection. He thus writes ...He's describing who knew what about the effects of selection and when. As I told betty boop, I see a curious and observant mind of 131 years ago pondering the origin of mankind.
I also see typical cretinist quote-scholarship in your citation.