To see an object that is in the dark both the eye and the light of the lamp are required.
To see the light alone, the eye is enough.
But to see the sun there is no need for any other light.
Our intellect or buddhi is of no use to realize the Self.
To see the world of external objects, the mind and the reflected light (or chidabhasa) which always rises with it are necessary.
To see the Self, the mind has simply to be turned inside and there is no need of the reflected light. Sri Ramana Maharishi