Quotation from: The Valley of the Moon

Written by: Jack London

"The ten acres didn't do a bit of it," she cried. "It was your
head that did it all, and you know it."

"And that's the point, my dear. It shows the right kind of person
can succeed in the country. Remember, the soil is generous. But
it must be treated generously, and that is something the old
style American farmer can't get into his head. So it IS head that
counts. Even when his starving acres have convinced him of the
need for fertilizing, he can't see the difference between cheap
fertilizer and good fertilizer."