Revelation depends upon purity of mind. Very often someone who is worldly-wise is not really wise. Intellectuality is one thing, wisdom is another thing. Not. all the knowledge learnt from books and from experiences in the world and collected in the mind as learning is wisdom. When the light from within is thrown upon this knowledge, then the knowledge from outer life and the light coming from within make a perfect wisdom; and it is that wisdom which guides man on the path of life.