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3. When that, giving up all forms, reflects only the meaning, it is Samādhi.

That comes when in meditation the form or the external part is given up. Suppose I were meditating on a book, and that I have gradually succeeded in concentrating the mind on it, and perceiving only the internal sensations, the meaning, unexpressed in any form — that state of Dhyana is called Samadhi.

त्रयमेकत्र संयमः ॥४॥