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Based on a lecture course given by Leonard Peikoff in 1972, this book provides essential knowledge for everyone whose life pursuits are threatened by our culture's widespread irrationality. "To fight for your values in a world such as ours, you must regard yourself as a psychotherapist of an entire culture, " states Dr. Peikoff in his opening lecture. "Its present state at any given time cannot be understood except as an outgrowth from its pas...

Based on a series of lectures given by Leonard Peikoff in 1981, Principles of Grammar offers not only an organized survey of grammatical rules and principles but their connection to the principles of clear thinking and clear writing. "At the end of the course, " says Dr. Peikoff, "you should be able to see every grammatical rule, directly or indirectly, as a consequence or expression of some essential requirement of the human mind, " not "a si...