I think of the purpose of life as something underivable and subjective in nature. Whether it is enlightenment, reaching nirvana, or anything else, I think it is important how one could perceive the personal subjective goal of life. Maybe the purpose of life is not like traveling, where the sole purpose of the journey is the arrival somewhere, but rather like music, where the purpose of the journey is the music itself, independent of where the final tone happens to be. The way to approach reaching enlightenment may not be like a journey with a point of arrival, but the search and progression towards enlightenment itself is the beauty and purpose of life. It is not a means to an end, it is a means for the beautiful sake of the mean itself.