Augustine of Hippo

"Sound the trumpet" [Psalm 81:3]. This is, Loudly and boldly preach, be not affrighted! As the Prophet says in a certain place, "Cry out, and lift up as with a trumpet your voice." [Isaiah 58:1] Sound the trumpet in the beginning of the month of the trumpet. It was ordered, that in the beginning of the month there should be a sounding of the trumpet: and this even now the Jews do in bodily sort, after the spirit they understand it not. For the beginning of the month, is the new moon: the new moon, is the new life. What is the new moon? "If any, then, is in Christ, he is a new creature." [2 Corinthians 5:17] What is, "sound the trumpet in the beginning of the month of the trumpet"? With all confidence preach ye the new life, fear not the noise of the old life.