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Eventually, he arrives at Jesus Christ, and invokes a well-known argument now known as Lewis's trilemma. You need a solid foundation that allows you to defend your faith in the midst of adversity; Mere Christianity helps you to build that foundation.
For instance: After starting the journey from his original question of where the ideas of "right" and "wrong" actually come from (He began this during the upheaval of WWII amid the question afforded the Allied Forces as opposed to the Nazis, which adds a unique understanding of his purpose) Lewis comes to accept that there must be an overall "good" force and "bad" force fighting for supremacy. Homes of the New York Herald Tribune Weekly Book Review wrote that "his clarity of thought and simplicity of expression have a magic about them which makes plain the most abstruse problems of theological speculation". The author is now firmly established as one of the most notable thinkers of this, or any generation, and the appearance of ‘Mere Christianity’ will be warmly welcomed.Lewis is full of these kinds of quotable statements throughout the book as he explains not why he believes, but what he believes. Where one is confused about what it means to be a Christian, how one is saved and changed, and what it demands of the individual, Lewis explains what it means to become a son or daughter of God. Unless I missed it, he seems to give no basis for this statement, besides asserting that it is true. To which my Dad turned around and agreed saying, "That is because most churches don't understand Christianity well enough and keep preaching works-based repentance.
For anyone not understanding what I mean by 'works-based repentance', it should be the assertion of every believe that is is by faith that you are saved.But taking the race as a whole, they thought that the human idea of decent behaviour was obvious to everyone.