Thus spoke Sri Ramana Maharshi

Who am I?

The best means of realisation is the enquiry Who am I?

The present trouble is to the mind and it must be removed by the mind only.

As each thought arises one must be watchful and ask whom is this thought occurring. The answer will be to me. If you enquire Who am I?. The mind will return to the source from whence it issued. The thought which arose will also submerge.