IV.— From the Same.
Matt. xiii. 31. The word which proclaims the kingdom of heaven is sharp and pungent as mustard, and represses bile, that is, anger, and checks inflammation, that is, pride; and from this word the soul's true health and eternal soundness flow. To such increased size did the growth of the word come, that the tree which sprang from it (that is the Church of Christ established over the whole earth) filled the world, so that the fowls of the air— that is, divine angels and lofty souls— dwelt in its branches.
Source: Fragments (New Advent)