Notes from Wikiquote
The obligation for interest is replaced by the obligation to repay the principal; thus after 20 or 25 years, depending on the interest-rate, the lent capital is repaid and the debt retired. ... | Through intensive enlightenment of the people, it is to be made clear to the people that money is and should be nothing other than a voucher for completed labor; that while every highly developed economy of course has need of money as a medium of exchange, the function of money also ends with that, and in no case should money be lent a supramundane power to grow of itself by means of interest, at the expense of productive labor.