The Bible does define itself, but one cannot ignore context, which modifies words for even the dullard.
To say it must mean the exact same thing in every case is not appropriate, or there could be no understanding
the Bible when it says such things as David was the apple of God's eye, or Jesus is a gate. The problem is
always that one defines it one way, and another, another way, and people make these allowances for them
selves but then refuse to acknowledge that others can and do and have the very same right to do the same.
Then you get people like N6 stomping around with his bellicose attitude accusing people of being in a cult
just about every time they express a view that differs from his, even though he makes up weird meanings
to suit himself... not to mention those who outright deny plain statements such as, God alone is immortal.