be profitable

References in classic literature ?
SOCRATES: If then virtue is a quality of the soul, and is admitted to be profitable, it must be wisdom or prudence, since none of the things of the soul are either profitable or hurtful in themselves, but they are all made profitable or hurtful by the addition of wisdom or of folly; and therefore if virtue is profitable, virtue must be a sort of wisdom or prudence?
So likely too, seeing that I affirm injustice to be profitable and justice not.
Now, I said, you are on more substantial and almost unanswerable ground; for if the injustice which you were maintaining to be profitable had been admitted by you as by others to be vice and deformity, an answer might have been given to you on received principles; but now I perceive that you will call injustice honourable and strong, and to the unjust you will attribute all the qualities which were attributed by us before to the just, seeing that you do not hesitate to rank injustice with wisdom and virtue.
If all the pupils are little ragamuffins, I'm afraid your crop won't be profitable in a worldly sense, Mr.
Consumers want farmers to be profitable because they are important to the economic viability of their communities, and they pay a large part of local taxes.