Remember, the trinitarian is claiming that this psalm is narrated by God the Father to God the son:
1 Hear my prayer, O LORD, and let my cry come unto Thee.
2Hide not Thy face from me in the day when I am in trouble; incline Thine ear unto me: in the day when I call answer me speedily.
3For my days are consumed like smoke, and my bones are burned as an hearth.
4My heart is smitten, and withered like grass; so that I forget to eat my bread.
5By reason of the voice of my groaning my bones cleave to my skin.
6I am like a pelican of the wilderness: I am like an owl of the desert.
7I watch, and am as a sparrow alone upon the house top.
8Mine enemies reproach me all the day; and they that are mad against me are sworn against me.
9For I have eaten ashes like bread, and mingled my drink with weeping,
10Because of Thine indignation and Thy wrath: for Thou hast lifted me up, and cast me down.
11My days are like a shadow that declineth; and I am withered like grass.
That's God speaking to Christ, is it? Read it through to the end - you will find that it is David
speaking directly to God
There is no possible
way it could be referring to the Father speaking to the son.