“Those arguments are not necessary, they are all supererogatory, like idle words.”

“It might be morally better to give the money to charity, but such contributions seem supererogatory, that is, above and beyond the call of duty.”

“We need not go on to the details of the role of Koranic recitation in other prayers, obligatory and supererogatory.”

“While Turner makes a heroic effort to throw off a number of the old dogmas, it would have been supererogative if he had repudiated them all.”