The Watch Tower Society has acknowledged its early leaders promoted "incomplete, even inaccurate concepts". The Governing Body of Jehovah's Witnesses says that, unlike Old Testament prophets, its interpretations of the Bible are not inspired or infallible. It says that Bible prophecies can be fully understood only after their fulfillment, citing examples of biblical figures who did not understand the meaning of prophecies they received. Watch Tower Society literature often cites Proverbs 4:18, "The path of the righteous ones is like the bright light that is getting lighter and lighter until the day is firmly established" (NWT) to support their view that there would be an increase in knowledge during "the time of the end", and that this increase in knowledge needs adjustments. Watch Tower Society publications also say that unfulfilled expectations are partly due to eagerness for God's Kingdom and that they do not call their core beliefs into question.