Life has obliged him to remember so much useful knowledge that he has lost not only his history, but his whole original cargo of useless knowledge; history, languages, literatures, the higher mathematics, or what you will – are all gone. 616
Perhaps the prevalence of pedantry may be largely accounted for by the common error of thinking that, because useful knowledge should be remembered, any kind of knowledge that is at all worth learning should be remembered too. 666
Useless knowledge can be made directly contributory to a force of sound and disinterested public opinion. 658
Considered now as a possession, one may define culture as the residuum of a large body of useless knowledge that has been well and truly forgotten. 689
