I am only one Sermon through the text.
"Aggressive Christianity":
Catherine Mumford Booth writes in this Sermon of her belief in what is fittingly termed: "Aggressive Christianity". According to her, the world has fallen from the original New Testament understanding of Christianity, and that this is primarily the result of Satan's influence. To her, this comes out in two ways: 1) in how we view ourselves; 2) in how we view our mission on Earth. The first is simply this: humans, contrary to modern preaching, are not lowly beings; they have higher being, a greater worth, than that which is attributed thereto. The second is basically that Christians should be militant in their attempt at saving souls. She uses Biblical scripture from the Acts of the Apostles (among others) to prove this*, and she believes this militancy to be an active duty of men; thus, you ought preach and cajole and persuade anyone, even the worst of the worst, to fall to their knees in favor of Christ Jesus, at penalty of being a bad Christian. Obviously, she doesn't mean that you need to be loud about it, or that you must renounce existence elsewise to do it (someone still needs to make the food, you know), but that one must do as best they can. She likens this duty to the duty of a Board of Health attempting to ameliorate the effects of a plague. If the people do not want to take the treatment that will save them, then this Board must use authoritarian measures to save them, or otherwise the world will be depopulated. It seems reasonable in this latter case, but for saving the soul, she seems to argues, it only seems unreasonable due to the influence of Satan on Christianity throughout the ages. This is one of those essays that is both extremely refreshing and extremely unfortunate. In my mind, the conversion to Christianity is not the most important thing, thus accounting for the 'unfortunate' side of things; but, on the other side, I also hold values which I deem important in the same manner she does. For example, I believe that the necessaries of life should be provided for every human being on Earth, and, because this is a moral ought that our society must deal with, anyone who does not attempt to ameliorate the lack of these important necessaries is by definition acting immorally. Thus, I think I can incorporate the refreshing understanding that we can get to higher things, by replacing Christian soul-saving with that of life-saving action (or, in my case, policies; private charity is very much not trustworthy).
*Sometimes, the vagaries of language as such that little comic thoughts appear to the most benign of phrases. Here, we see Booth exclaim that any living Creature must be preached to, and, because of the use of Creature, all I could imagine was deep council with the frogs in the garden, or chasing after a rabbit in order to gift it a Bible. This comic idea is a strawman, of course: Booth clarifies that the Creature must have a soul, and I reckon that she thinks only humans have one. But, perchance, my little idea here was in her mind.
"A Pure Gospel":
This Sermon attempts to identify what the Gospel is. This, however, is not about parsing what is and isn't real in the Bible, how to interpret most laws, or any of that; rather, it is about arguing that God requires one thing from a person before He saves them. (And, He does save them; it is through the power of God working within a person, in a sense controlling that person, that this change occurs. It is curious to note the use of control again, for the first Sermon also has themes of control and force.) This thing that God requires is to renounce your sin (or Idol, as it happens) and be willing to be Obedient to God. If you turn from Satan to Christ, then God will do the rest, basically; you have to make the first step. Thus, the more Russian Orthodox opinion of salvation based upon belief is repudiated by our authoress, and she is obviously against Antinomianism within Christianity. I don't have much to say about this Sermon, but I liked how Booth used Biblical stories to craft the arguments she makes.