Here the word "souls" refers to the whole person. The abstract noun "salvation" can be translated with a verb. Alternate translation: "your salvation" or "God saving you" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-abstractnouns]])
These words present two ideas as if they were things or objects. In reality, "salvation" refers to the action of God saving us, or to what happens as a result. Similarly, "grace" refers to the kind way in which God deals with believers.