"The Lord is my shepherd; I shall not want. He causes me to lie down in green pastures; He leads me beside still waters. He restores my soul; He leads me in paths of righteousness for His name's sake.
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A metaphor is used: "The Lord is my shepherd..."
The phrase; "The Lord is my shepherd...," can also be used as a simile to mean that God guides the writer just as a shepherd guides the sheep.
Imagery is used: "...He causes me to lie down in green pastures; He leads me besides still waters..."
When making a heading for your essay, it should be located in the beginning of the whole essay. This is what makes the essay come to life and what start's off the essay well.