God constantly being faithful and trustworthy is spoken of as if faithfulness and trustworthiness were objects of which God has a large quantity. The two abstract nouns can be translated as adjectives. AT: "always faithful to your covenant and very worthy of people trusting you" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-abstractnouns]])
The abstract noun "strength" can be stated as a verb or an adjective. AT: "strengthen your servant" or "make your servant strong" (See: [[rc://en/ta/man/translate/figs-abstractnouns]])
# your servant ... the son of your servant woman
The writer is speaking about himself in the third person. (See: [[rc://en/ta/man/translate/figs-123person]])