Words are useful and support community of understanding when those who use them are “on the same page,” as the cliché has it. Some language works against this through ambiguity or vagueness, which no doubt mirrors the corresponding weakness in human consciousness. Each person is free to spin words and concepts in a certain way, often without regard to the language of another or the confusion engendered. We can mitigate this Tower of Babble effect by paying close attention to the thinking and communicating process as mediated by words. One aspect of this pertains to the degeneration of terms and concepts.
Perhaps one of the most difficult word-meaning problems occurs in cases where the same word can mean opposite things. This sometimes occurs where unfriendly forces hijack a word with a benevolent tradition. For instance, a dictionary shows that the word “mystic” has suffered some debasement, having spilled over in its usage with the word “occult,” a term with some unsavory magical associations. So, a given word may point to it’s opposite where popular thought arrives at a strange mix of dark and light, of spiritual and anti-spiritual connotations.