The soul represents the person or his emotions. Being calm and peaceful is spoken of has having making one's soul still and quiet. Alternate translation: "I am calm and peaceful" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-metaphor]])
The psalmist speaks of himself being content and resting as if he were a young child that no longer demands breast milk from his mother. Alternate translation: "content like a young child that no longer cries for breast milk but rests in his mother's arms" or "content and resting" (See: [[rc://en/ta/man/translate/figs-metaphor]])