Those who meddle with astrologers and sorcerers (and like practices) put themselves on a collision course with God's judgment.
Man is not promised an endless supply of strength for him to store up. Rather, God promises to provide the necessary grace and strength for the present trials.
There are many things in this life that are not sinful in and of themselves, but when they are misused they can be deemed as sinful or harmful.
Throughout man’s sordid history, people have mocked, rejected, and forsaken the Lord. They have chosen to look to gods that cannot save or help.
Why would the Lord invite those weary from labour to wear a yoke? And then, why would the Lord promise rest by inviting people to labour?
