Saint Jerome in his sermon on Psalm 41 gave an immortal reflection on the Trinity:
Like a deer that longs for springs of water, so my soul longs for you, O God. Now just as those deer long for springs of water, so do our deer. Fleeing Egypt – that is, fleeing worldly things – they have killed Pharaoh and drowned all his army in the waters of baptism.
Now, after the devil has been killed, they long for the springs of the Church: the Father, the Son, and the Holy Spirit.
We can find the Father described as a spring in Jeremiah: They have abandoned me, the fountain of living water, to dig themselves leaky cisterns that cannot hold water.
About the Son we read somewhere: They have forsaken the fountain of wisdom. Continue reading
 And there shall come forth a rod out of the root of Jesse, and a flower shall rise up out of his root.  And the spirit of the Lord shall rest upon him: the spirit of wisdom, and of understanding, the spirit of counsel, and of fortitude, the spirit of knowledge, and of godliness.  And he shall be filled with the spirit of the fear of the Lord. He shall not judge according to the sight of the eyes, nor reprove according to the hearing of the ears.  But he shall judge the poor with justice, and shall reprove with equity for the meek of the earth: land he shall strike the earth with the rod of his mouth, and with the breath of his lips he shall slay the wicked.  And justice shall be the girdle of his loins: and faith the girdle of his reins. Continue reading
13I beheld therefore in the vision of the night, and lo, one like the son of man came with the clouds of heaven, and he came even to the Ancient of days: and they presented him before him.
14And he gave him power, and glory, and a kingdom: and all peoples, tribes and tongues shall serve him: his power is an everlasting power that shall not be taken away: and his kingdom that shall not be destroyed.
Saint Jerome wrote an extensive commentary on the Book of Daniel. Here is his commentary on these verses: Continue reading