But when a word stands for a very complex idea that is compounded and decompounded, it is not easy for men to form and retain that idea so exactly, as to make the name in common use stand for the same precise idea, without any the least variation.

Hence it comes to pass that men's names of very compound ideas, such as for the most part are moral words, have seldom in two different men the same precise signification; since one man's complex idea seldom agrees with another's, and often differs from his own--from that which he had yesterday, or will have tomorrow.
7.

Secondly because they have no Standards in Nature.
Because the names of mixed modes for the most part WANT STANDARDS IN NATURE, whereby men may rectify and adjust their significations; therefore they are very various and doubtful.

They are assemblages of ideas put together at the pleasure of the mind, pursuing its own ends of discourse, and suited to its own notions; whereby it designs not to copy anything really existing, but to denominate and rank things as they come to agree with those archetypes or forms it has made.

He that first brought the word SHAM, or WHEEDLE, or BANTER, in use, put together as he thought fit those ideas he made it stand for; and as it is with any new names of modes that are now brought into any language, so it was with the old ones when they were first made use of.