Long ago, there was a 4th form of Philosophy, known to most as Magic. Scientific philosophy is based on theories of indisputable laws of the natural world that, barring the interference of philosophers, will continue to work no matter what. Religious Philosophy draws it's powers from the Gods and the tenants said Gods up hold. Personal Philosophy (sometimes called Neutral Philosophy) is based on personal morals and beliefs, drawing power from the purity of one's own convictions, rather than convictions gained from knowledge of the world or belief in a God. The 4th kind of philosophy is now extinct, it was primitively known as magic (since it's abilities were as wide as anything the human imagination could come up with), and drew power straight from the imagination, artists of all kinds can still tap the last vein of power left to Imaginary Philosophy.
The Fourth Form Of Philosophy