Bhagavad Gita · Chapter 5: Renunciation in Action

Bhagavad Gita 5.24

yo'ntaḥsukho'ntarārāmastathāntarjyotireva yaḥ | sa yogī brahmanirvāṇaṃ brahmabhūto'dhigacchati ||

One whose happiness is within, whose delight is within, and whose light is within: that yogi, having become one with Brahman, attains liberation in Brahman.

Modern context

Three things are said to be 'within': happiness, delight and light. Happiness within means not needing circumstances to be right. Delight within means not needing entertainment. Light within means having one's own guidance, so that direction does not have to come from the approval of others. A person like this is not withdrawn or unfriendly. They are whole, and they meet the world out of sufficiency and not out of need.