Nicholas Rescher offers his perspectives on many of the foundational concerns of philosophy. He sees the need to inquire as an evolutionary tool for adapting to a hostile environment and shows how philosophy has developed in an evolutionary fashion, building upon acquired knowledge and upon itself. In a historical thread that informs and enriches his overview, Rescher recalls Aristotle, Plato, Plotinus, Kant, Hegel, Leibniz, Laplace, Bertrand Russell, and others. Overall, he argues for philosophy as an unavoidable instrument for rational, cogent responses to large questions.