Greener pastures
The greener pastures described in this psalm symbolizes serenity, peace, and calmness. According to the speaker, this is something that the presence of God fills his life with. In these green pastures, the speaker feels at ease and relaxed.
Still waters
Again, the image of still waters represents peace and serenity. The still nature of the water represents the lack of stress and worry in the speaker's life, as he feels protected and sheltered by God.
Paths of righteousness
The paths of righteousness described by the speaker represent moral choices and a virtuous life. The speaker is guided by God down these paths, which suggests this choice is influenced by divine moral guidance.
The valley of the shadow of death
The valley of the shadow of death is a dark symbol, representing the evil in the world. This image suggests that there are frightening things a person must encounter during their lives, but that this is made easier by the presence of God.
Rod and staff
The speaker states that the evil of "the valley of the shadow of death" is made easier to bear by God's presence. Specifically, his rod and staff are mentioned, which symbolize his ability to protect his "flock" from harm.