Commentary
The characteristics of a devotee who has attained the realization of oneness with the divine are described in this verse.
With their minds wholly in Me (Matchittah): Once a person’s intellect is convinced that the essence behind the God principle (Ishwara) and the individual ego (Jiva) is one and the same, any agitating feelings in the mind and disturbing thoughts in the intellect will not upset him and he will constantly be aware of the Conscious principle or the Self behind them all.
With their senses absorbed in Me (Mat-gata-praanaah): Here Prana indicates the five sense organs. The implication is not to run away from the sense objects but to have discrimination through which one can regulate and train his thoughts so that in any situation in life he will always be reminded of the Eternal Consciousness without which any sense object could not have been illumined for the mind to experience it.
Discussing with one another: Mutual discussion about Brahma Vidya enables crystallization of ideas and attaining deeper insight into the amount of knowledge gained.
A true seeker is the one who remembers constantly the Consciousness principle. They ultimately lead him to be free from external circumstances and inner dissatisfactions. He experiences a sense of contentment and delight which provide an ideal backdrop for the spiritual progress.
Swami Chinmayananda
Swami Chinmayananda Commentary
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Adi Sankara Commentary
Maccittah, with minds fixed on Me; mad-gata-pranah, with lives (pranas) dedicated to Me, or having their organs, eyes etc. absorbed in Me, i. e. having their organs withdrawn into Me; bodhayantah, enlightening; parasparam, each other; and nityam, always; kathayantah, speaking of; mam, Me, as possessed of qualities like knowledge, strength, valour, etc; tusyanti, they derive satisfaction; and ramanti, rejoice, get happiness, as by coming in contact with a dear one.
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Srimad Bhagavad Gita Chapter 10 – Verse 9 – 10.9 maccitta madgataprana – All Bhagavad Gita (Geeta) Verses in Sanskrit, English, Transliteration, Word Meaning, Translation, Audio, Shankara Bhashya, Adi Sankaracharya Commentary and Links to Videos by Swami Chinmayananda and others – 9-Oct

