All of the Dharma is based on Buddha's discovery that suffering is unnecessary: Like a disease, once we really face the fact that suffering exists, we can look more deeply and discover it's cause; and when we discover that the cause is dependent on certain conditions, we can explore the possibility of removing those conditions. Through mantra, we no longer cling to the reality of the speech and sound encountered in life, but experience it as essentially empty. Then confusion of the speech aspect of our being is transformed into enlightened awareness.