What is philosophy? We all know it is "love of wisdom". But practically speaking, in the real world as it is practised and instantiated by fun-loving people everywhere. Is philosophy an attitude? An academic discipline? A body of knowledge? Is it the foundation of all other knowledge? Or the culmination of it? Or just one specialized branch? What makes one a philosopher? A degree? Or a passion?

For me, first and foremost, comes an unwillingness to accept, either the way things are, or the interpretation of the way things are. Dissatisfaction. But then it is what you do with that dissatisfaction that determines whether your next steps are on the philosophical path...or not.

Maybe Aristotle?

Since we are seeking this knowledge, we must inquire of what kind are the causes and the principles, the knowledge of which is Wisdom. If one were to take the notions we have about the wise man, this might perhaps make the answer more evident. We suppose first, then, that the wise man knows all things, as far as possible, although he has not knowledge of each of them in detail; secondly, that he who can learn things that are difficult, and not easy for man to know, is wise (sense-perception is common to all, and therefore easy and no mark of Wisdom); again, that he who is more exact and more capable of teaching the causes is wiser, in every branch of knowledge; and that of the sciences, also, that which is desirable on its own account and for the sake of knowing it is more of the nature of Wisdom than that which is desirable on account of its results, and the superior science is more of the nature of Wisdom than the ancillary; for the wise man must not be ordered but must order, and he must not obey another, but the less wise must obey him. (Metaphysics, Book 1, part 2)