As a lamp in a windless spot does not flicker, so is the man of subdued thought who practices union in the Self.
When the mind is disciplined and becomes still, and when the Self is self-perceived with inward delight,
And when he knows the infinite joy, which is beyond the grasp of the senses and can only be experienced by the understanding heart, and is established in his spiritual truth, the innermost truth of his being,
Then has he found the treasure incomparably greater than any other.
— Shri Krishna, Bhagavad Gita, 6:19-22