See how new and how wonderful this mystery is. He has not yet left the womb but he speaks by leaping; he is not yet allowed to cry out but he makes himself heart by hi actions...; he has not yet seen the light but he points out the Sun; he has not yet been born and he is keen to act as Precursor. The Lord is present, so he cannot contain himself or wait for nature to run its course: he wants to break out of the prison of his mother's womb and he makes sure he witnesses to the fact that the Savior is about to come.
Saint John Chrysostom, "Sermo Apud Metaphr., Mense Julio"
