yo 'ntaḥ-sukho 'ntar-ārāmas
tathāntar-jyotir eva yaḥ
sa yogī brahma-nirvāṇaḿ
brahma-bhūto 'dhigacchati
yaḥ — one who; antaḥ- sukhaḥ — happy from within; antaḥ- ārāmaḥ — actively enjoying within; tathā — as well as; antaḥ- jyotiḥ — aiming within; eva — certainly; yaḥ — anyone; saḥ — he; yogī — a mystic; brahma- nirvāṇam — liberation in the Supreme; brahma- bhūtaḥ — being self-realized; adhigacchati — attains.
Unless one is able to relish happiness from within, how can one retire from the external engagements meant for deriving superficial happiness? A liberated person enjoys happiness by factual experience. He can, therefore, sit silently at any place and enjoy the activities of life from within. Such a liberated person no longer desires external material happiness. This state is called brahma-bhuta, attaining which one is assured of going back to Godhead, back to home.