As instruments for knowing the objects, the sense organs are outside, and so they are called outer senses; and the mind is called the inner sense because it is inside. But the distinction between inner and outer is only with reference to the body; in truth, there is neither inner nor outer. The mind's nature is to remain pure like ether.

The means that make one qualified for enquiry are meditation, yoga, etc. One should gain proficiency in these through graded practice and thus secure a stream of mental modes that is natural and helpful.

There is no doubt whatsoever that the universe is the merest illusion.

Ramana Maharshi Quotes