It is like the words to the opening scene of the American television series Star Trek: if space is the final frontier, unexplored by humans, then the human mind is the final frontier for our inner exploration.
如同美國影集《星際巡航》在序幕所言：如果太空是人類向外探索的最後一塊未知領域，那麼人腦就是我們向內探索的最後一塊未知領域。