Blessed is the man who walks not in the counsel of the ungodly,
nor stands in the way of sinners,
nor sits in the seat of the evil men.
But his will is in the law of the Lord; and in His law he shall meditate day and night.
He shall be like the tree which is planted by streams of waters, which shall yield its fruit in its due season;
and his leaf shall not wither,
and in everything he does he prospers.
(Psalm 1:1-3, Septuagint)

The water here is a symbol of the Holy Spirit …
This water is the living water, or the water of life.
It is the living water of which the Lord told the Samaritan woman to drink:
“Whoever drinks of the water that I shall give him will never thirst.
But the water that I shall give him will become in him a fountain of water
springing up into everlasting life” (John 4:14).
You will be like a tree planted by the rivers of water where the Spirit of God hovers (Gen 1:2).
Note how the psalmist says “rivers of water” and not “waters”.
It is because the water of rivers is running water, so it is clean water –
unlike stagnant water which stinks.
Here, you have many rivers of water from which to drink.
The word of God quenches your thirst.
Also, the psalms, prayers, liturgies, praises, songs, contemplations, and holy communion quench your thirst.
Truly, many are the rivers of water that nourish the tree of your life.
If you remove this tree from the rivers of water,
it will fade, its leaves will fall, and it will not give fruit.
His Holiness Pope Shenouda III