 In the early 1930s Ortega formulated, in a systematic fashion, his general philosophical standpoint—positing human life as the ultimate reality—which contains philosophy within history. He presents it in his book En Torno a Galileo (1933), by way of his theory of generations, and in his essay History as a System (1935). The “concept of being” or “human life”, for Ortega, “is the very root of philosophy”, and, therefore “any reform of the idea of being means a radical reform in philosophy”. At this point, he abandoned the “biological organism” content of his earlier notion of life in The Theme of Our Time to incorporate a concept of life—“the life of each one of us”—as a being-that-lives-in-the-world. “Biologists”, he averred,