It cannot be philosophically demonstrated that things exist outside the perceivers mind and that the information received from the senses is a reflection of the true reality and not an illusion. But a non-philosophical mind is never plagued with doubts about the reality of existence—it plays the game of life without questioning the senses. It’s only the philosophical mind that is capable of doubting the senses and treating existence with skepticism. A philosophical mind is a rare entity; majority of the people are non-philosophical—they plunge headlong into the game of living the life of laborers, farmers, soldiers, scientists, businessmen, politicians, etc., without being plagued with philosophical doubt. The tendency towards philosophical doubt is not only the trait of the philosophical mind but also the fountainhead of philosophy.