Knowledge is not formed (at least sometimes) by the brain, but it exists, saying conditionally, in continuum  (or in UDI – Universal Depot of Information [ 3e, ð. 62]), like to a coal field, a geologist finds which but not produces it.
There isn't any qualitative difference between information and a thought-knowledge (possession of the information), there is only quantitative difference - in time/duration of their existence:
  a thought comes to mind for several instants, and is changed by other thoughts;
information was already before it touches the mind, becomes a knowledge, and it remains after it is changed by other thoughts.
To return to some ("old", former) thought, particularly - to recall something, means to bring to light the same ("old") information, to obtain it again from UDI by means of activation of a respective channel to UDI. Mnemonics is an art of producing such channels and using them. Postcarnatee activates channels directed to precarnatee life episodes spontaneously.
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