This dissertation includes three papers on Nietzsche’s solution to the problem of life-affirmation. The first paper, History of Freedom, argues that to understand Nietzsche’s various conflicting claims on freedom, we must look at the historical story of freedom Nietzsche tells across his multiple works. The central idea is that freedom is an instinct we have, and it is an instinct for mastering our internal drives and external circumstances and creating the life we can affirm. The second paper, Crowding Out Heaven, a reading of Nietzsche’s Eternal Recurrence, addresses the question of the “how do we know” of our state of life-affirmation. I argue that Nietzsche thought experiment of eternal recurrence serves as a hypothetical alternative cosmology to that of Christianity. While Nietzsche does not hold the cosmology to be true, he thinks it is useful for revealing whether one secretly relies on one of the ascetic ideals such as eternal afterlife or some scientific or moral final stage of the world. The third paper, An Invigorated Life, argues that artistic appreciation and creativity is an answer to the “how do we do it” of life-affirmation. That art serves as a justification for life is a thought Nietzsche holds consistently throughout his body of work. In this paper, I offer an original interpretation of this thought. My interpretation argues that for Nietzsche, art justifies life in a twofold manner: (1) the appreciation of artworks emotionally invigorates the individual, urging them to create their life artistically, and (2) the life thus created has the affective quality of vigor and can thus be experienced as a beautiful life by the individual living it.