The correct answer is: philosophy. This term comes from Greek "philosophia" which means: "love of knowledge, pursuit of wisdom, systematic investigation", and comes from: "philo" - loving and "sophia" - knowledge, wisdom. This expression was probably coined by Pythagoras. Philosophy is human intellectual activity with the purpose to study the general and fundamental nature of existence, reality, knowledge, reason, value, mind, language, etc. Major areas of philosophy are: logic, epistemology, metaphysics, ethics, political philosophy, etc.