Verses 11 through 13 provide a shift from a negative perspective (an evil man cannot do good works) to the more positive expression that “that which is of God inviteth and enticeth to do good continually.”
With the Book of Mormon perspective that only discusses the widely opposed poles of good and evil, evil comes from the evil one, and “good cometh of God.”
As the next logical step, Mormon has established that we can know that something is of God because it is good. However, how do we know what is good? He turns to that question in the next verses.