Is the Trinity in Psalms?

Psalms is one of the longest books in the Bible. Based on what many scholars and experts assert, we would expect to find this doctrine in such a long and prominent Bible book. Is the Trinity in Psalms?
Does it strike you as odd that even the most scholarly proponents of the doctrine admit it is neither understandable nor explainable?
“The most difficult thing about the Christian concept of the Trinity is that there is no way to completely understand it or explain it. God is infinitely greater than we are; therefore, we should not expect to be able to fully understand Him. But we do trust the Bible, which teaches that the Father is God, Jesus is God, and the Holy Spirit is God. At the same time, the Bible also teaches there is only one God. So, the one God exists in three Persons.
It’s possible to understand some facts about the Trinity and some of the relationships the different Persons of the Trinity have to one another. But, ultimately, how a single Being can exist in three distinct Persons is incomprehensible to us. Our inability to understand, however, does not mean the doctrine of the Trinity is untrue or unbiblical. The word Trinity is not found in Scripture. It is a useful term in discussions of the triune God, as we speak of three coexistent, co-eternal divine Persons who are One. Although the word itself is not found in the Bible, the concept represented by the word Trinity certainly is.”-–GotQuestions.org