106 Therefore we ought with all our power to observe what is the signification of the trumpets, lest, accepting them, like old women, as part of the story, we should be in danger if we were to think things unworthy of spiritual teaching, or not befitting the dignity of the Scriptures. For when we read that our warfare is not against flesh and blood, but against spiritual hosts of wickedness, which are in high places, we ought not to think of weapons of the flesh, but of such as are mighty before God. It is not enough that one see the trumpet or hear its sound, unless one understands the signification of the sound. For if the trumpet give an uncertain sound, how shall one prepare himself for war? Wherefore it is important that we understand the meaning of the voice of the trumpet, lest we seem barbarians, when we either hear or utter trumpet-sounds of this sort. And therefore when we speak, let us pray that the Holy Spirit would interpret them to us.
Source: On the Death of Satyrus (New Advent)