One goal that Mencius had was to grow what he called an "unmovable mind." By those words he meant a mind that could not be knocked around by being hit from the outside. An "unmovable mind" is guarded against doing the wrong thing because one is angry, afraid, etc. Anything that can pull or push from the outside and make us go out of control could cause harm, but Mencius says that if the will and the four virtues/powers are well integrated, if the person is "really together," then these outside forces cannot take over control.