There appear to be a number of spellings and versions of this saying: the above seems to be one of the most popular on Google, and that used in the Wicca article.
Other versions include :
Compare and contrast with Aleister Crowley's 'Do what thou wilt shall be the whole of the Law' - presumably intended as a reaction to the above?
The Rede is seen by both Wiccans and outside observers as yet another way of expressing the Golden Rule, a belief that is found in nearly every religion. In addition to the concept of ethical reciprocity expressed by most versions of the Golden Rule, however, the Rede also expressly rejects the concept of sin outside of harm to oneself or to another.
The rejection of specific exhortations and prohibitions of conduct such as those given in the Ten Commandments in Christianity makes its character somewhat different. The Rede is a only a guideline which the individual must interpret to fit each particular situation.