No More Learning

But I cannot conclude from another           that _I now
think_; for tho a Man may _think_ that he _hath thought_ (which consists
only in _memory_) yet ’tis altogether impossible for him to _think_ that
he _now thinks_, or to _know_, that _he knows_, for the question may be
put _infinitely_, how do you _know_ that you _know_, that you _know_,
that you _know_?