This is a superscription that tells about the psalm. Some scholars say that this is part of the scripture and some say that it is not. (See "What are Superscriptions in Psalms" in [Introduction to Psalms](../front/intro.md).)
Here David is referring to himself by his heart. Also, the word "fixed" means to trust completely. Alternate translation: "My heart is fixed on you, God" or "I am trusting completely in you, God" (See: [[rc://en/ta/man/jit/figs-synecdoche]] and [[rc://en/ta/man/jit/figs-idiom]])
Here David is represented by his "glory." David refers to himself as having the honor of praising God. Alternate translation: "You honor me by allowing me to sing praises to you" (See: [[rc://en/ta/man/jit/figs-synecdoche]])