6. Constantly repeated ideas can scarce be lost.
But concerning the ideas themselves, it is easy to remark, that
those that are oftenest refreshed (amongst which are those that are conveyed into the mind by more ways than
one) by a frequent return of the objects or actions that produce them, fix themselves best in the memory, and
remain clearest and longest there; and therefore those which are of the original qualities of bodies, vis. solidity,
extension, figure, motion, and rest; and those that almost constantly affect our bodies, as heat and cold; and those
which are the affections of all kinds of beings, as existence, duration, and number, which almost every object that
affects our senses, every thought which employs our minds, bring along with them;--these, I say, and the like
ideas, are seldom quite lost, whilst the mind retains any ideas at all.
