If one is fit for it (Meditation) one might directly hold the thinker; and the thinker will automatically sink into his source, namely Pure Consciousness.

Devotee:  What should one think of when meditating?

Ramana Maharishi:  What is meditation? It is expulsion of thoughts. You are perturbed by thoughts which rush one after another. Hold on to one thought so that others are expelled. Continuous practice gives the necessary strength of mind to engage in meditation. Meditation differs according to the degree of advancement of the seeker. If one is fit for it one might directly hold the thinker; and the thinker will automatically sink into his source, namely Pure Consciousness. If one cannot directly hold the thinker one must meditate on God; and in due course the same individual will have become sufficiently pure to hold the thinker and sink into absolute Being.