Nietzsche is profound and powerfully insightful, psychologically. He wrote many uniquely stylized books that expounded upon a deep historical and philological (study of languages and their texts) understanding of our ancient and even prehistoric behavior, beliefs, and how these have shaped our "modern" attitudes (conscious and subconscious) toward each other's actions and lifestyles. We have a life, and we can chose to exercise it or let it atrophy. He encourages the former.