Bide The Wiccan Rede ye must,
In perfect love and perfect trust.
Eight words The Wiccan Rede fulfill,
An it do no harm, do what ye will.
Lest in thy defense it be,
Ever mind the Rule of Three.
Follow this with mind and heart,
And merry meet, and merry ye part.
Some of this comes from Lady Gwyn Thompson's version and some from Doreen Valiente's version with a bit added by the unknown author. This is the version that I tend to apply when considering my actions.