Note 157 — Chapter XII · THE LAW FOR HUMANITY.
Reading edition
‘semel traditi nobis boni perpetua possessio est; non dediscitur virtus. contraria enim mala in alieno haerent, ideo depelli et exturbari possunt’ Sen. Ep. 50, 8. Just in the same spirit we say that a new language or (say) the art of swimming, if once learnt, is learnt ‘for good.’