The Society periodically releases indexes covering scriptural references and topics discussed from everything published during the most recent years. Less frequently, larger indexes are published that combine many years together under a hard cover. The Society is fully aware of what it has published in the past on any given topic. The Index lists references in reverse chronological order. In case of conflict the most recent information supersedes whatever has preceded it.
New information is considered as correction rather than conflict or contradiction.
The word is almost always applied literally rather than being applied figuratively to one's spiritual condition, though I know of no reason why it could not be used that way. When my teacher asked me what I was planning to do over Christmas vacation, I used the opportunity to give an informal witness. A bulletin board. Four people have written to inform me that this is because the origin of the word bulletin is connected with papal bulls, i.e., edicts from the pope. Various popes have certainly posted a lot of bull, so this assertion is believable.