According to Osho, authenticity in acting is preserved when you see that you are not the doer—the Divine is. Acting means functioning as an empty instrument, like a flute, letting existence play through you. Then the inner and outer are one, egoic claim drops, falsehood ends, and action becomes the highest authenticity.
Be like a flute: don’t think you make the music—let life play through you, and you’ll be real.