内容简介：
If any word of mine shall add to the number of the readers of this book I shall be glad to have written it; and I sincerely wish that all believers, and especially all ministers and Christian workers, might in some way be led to read it. The subject is vital to any right understanding of the age in which we live, and of the personal conflict which we wage; for the existence, personality, and power of Satan are awful facts and of immense present significance