by John Marshall Harlan, Fowler v. Equitable Trust Company…
“ Such is the uniform construction of the statute, which, in the case of usury in a loan, forfeits the whole of the interest contracted to be received, and permits a recovery only for the principal sum due. As there is no interest really due if the transaction be usurious,-the right to recover interest being forfeited at the moment the contract of loan is consummated,-whatever the borrower pays on account of the loan must go as credit on the principal sum; otherwise, the usurer would get the benefit of his illegal contract, and the statute be rendered inoperative. ”
