We tend to think of good and evil as diametrically opposed forces or tendencies within us. For the purposes of operationally defining univocal terms to use in philosophical discourse, we define evil as that which is not good -- and vice versa (good is that which is not evil). But Martin Buber (1878-1965) invokes the Talmudic doctrine of two urges (a good and an evil urge) to explain how you can love God with your whole heart.
