Perhaps the greatest exponent of self-inquiry and Self-realisation is Sri Ramana Maharshi. The genius of his method, in it’s simplicity and power, is unexcelled.
Who is the knower? This is the fundamental question.
Who am I?
But remember, the answer to this question is experiential not conceptual.
So ‘look’, don’t think. Observe, don’t analyse. Experience, don’t imagine.
You ARE the answer.