This short book describes in a vivid way the constant battle
going on in human history between the good and evil spirits.
These spirits or angels have intellects and wills of their own,
and direct themselves freely towards good or evil. Besides struggling
with each other, they particularly fight for the souls of human beings,
either to condemn them or to save them. These battles can be seen
both in Sacred Scripture and in key events throughout human
history; they will culminate in the final victory of the Lamb or
Last Judgement, where the kingdom of Christ and his angels will
triumph forever.