Empirical science historically developed out of philosophy or, more specifically, natural philosophy. Natural philosophy was distinguished from the other precursor of modern science, natural history , in that natural philosophy involved reasoning and explanations about nature (and after Galileo , quantitative reasoning), whereas natural history was essentially qualitative and descriptive.
Philosophy seeks to understand truths about the world and how we view it. It tries to answer important questions by making conclusions based on observations of human nature and the real world. Sometimes, philosophy tries to answer the same questions as religion and science .
Methodological naturalism is the principle underlying all of modern science. Some philosophers extend this idea, so that it applies to all of philosophy as well. Science and philosophy, according to this view, are said to form a continuum. W.V. Quine, George Santayana, and other philosophers have advocated this view.