According to Osho, 'sitting silently doing nothing' is not the same as 'looking into one's own being.' Looking is still a subtle doing, sustained by effort and desire, hence ego and tension. Non-doing means no movement inward or outward, no goal—even nirvana. In pure, desireless awareness—non-seeking—the division of in/out dissolves, and samadhi happens by itself, as something allowed, not achieved.
Looking inside is still trying; real meditation is stopping all trying and just being here without wanting anything.