The Eight Limbs of Yoga are yama, niyama, asana, pranayama, pratyahara, dharana, dhyana and samadhi. While the first four limbs are external, pratyahara is the stage where the transition happens from outer to inner, and the last three limbs are inner or most intimate. Crossing the boundary to antar is when subtler realities are explored.
Antar mouna, meaning "inner silence," is a practice that helps the yogi go within and achieve mastery over the mind. By practicing antar mouna, the yogi progresses from the state of witnessing to mindfulness and, finally, to self-awareness. The practice helps to control the over-active mind and develop cognitive function and self-confidence to progress spiritually.