Plato can be understood as idealistic and rationalistic, much like Pythagorus but much less mystical. He divides reality into two: On the one hand we have ontos, idea or ideal. This is ultimate reality, permanent, eternal, spiritual. On the other hand, there’s phenomena, which is a manifestation of the ideal. Phenomena are appearances -- things as they seem to us -- and are associated with matter, time, and space.
Philosophy, the love of wisdom, was for Socrates itself a sacred path, a holy quest -- not a game to be taken lightly. He believed -- or at least said he did in the dialog Meno -- in the reincarnation of an eternal soul which contained all knowledge. We unfortunately lose touch with that knowledge at every birth, and so we need to be reminded of what we already know.