What is ego and how can one distinguish it from the true self?

According to Osho, the very seeker who asks is ego; whatever you claim as 'I' or 'mine'—even prayer, humility, renunciation—is ego's camouflage. Don’t spare exceptions; see totally that all you have is ego. This radical seeing leaves ego nowhere to hide; then it collapses by itself. What remains isn’t a personal self but pure, boundless existence—the sky when the courtyard walls fall.