Religion becomes a costume the ego wears when it can no longer wear success. Sackcloth is as much an ornament as silk if someone is watching, and someone is always watching, at minimum the man himself, admiring his own renunciation. The bowed head like a reed is a posture, and postures are precisely what the mind knows how to produce.
Suffering has never purified anyone. Denial only feeds what it pretends to starve, because the one who denies is still the false center, now decorated with humility. What was asked for was a dropping, not a performance. When the pretender is seen for what it is, no ashes are required and nothing is left to advertise.