Bhagavad Gita, Chapter 5, Verse 27-28

Shutting out external objects, steadying the eyes between the eyebrows, restricting the even currents of Prâna and Apâna inside the nostrils; the senses, mind, and intellect controlled, with Moksha as the supreme goal, freed from desire, fear and anger, such a man of meditation is verily free for ever.

Some real, specific techniques are being described here, not just abstract encouragement to 'let go.'

This gets concrete about actual practice, breath, gaze, focus, rather than staying purely conceptual. Real discipline usually needs something specific to actually do, not just an idea to agree with.