This line is found in both the wiccan belifes and the christian belifes.
Do as thou wilt so long as you harm none.
Do unto others as you would have them do unto you.
Both say the SAME thing.
You have free will to do exacly AS you please.
BUT do not do evil do not do harm do not cause hurt to others less it comes back upon YOU.
thats it thats all thats needed in all these rules and passages are only there to reinforce that and little more.
Complex as things look people try to find a complex answer...when sometimes the answer is as simple as just breathing
One difference between Wicca and Christianity that I see here is that the Christian God is a demanding one. He not only wants us to refrain from harming each other, but we must also accept Jesus Christ as the
only path to salvation and reject various customs that go against His wishes.