Questions about how you can know if something you’re doing is a sin, what the author of Ecclesiastes meant when he said, “There is nothing new under the sun,” and whether the possibility that Moses was a lunatic or liar brings the whole Tanakh and New Testament into doubt.  * How do you know if something you’re doing is a sin? * Since there are new things every day, what did the author of Ecclesiastes mean when he said, “There is nothing new under the sun”? * If Moses could have been a lunatic/liar, does that start a chain reaction that brings the Tanakh and the New Testament into doubt?