The repetition of these phrases is to show that the lessons are valuable for all sorts of things. It also speaks of those lessons as if they were people. (See: [[rc://en/ta/man/translate/figs-parallelism]] and [[rc://en/ta/man/translate/figs-personification]])
These three phrases mean basically the same thing, and together they show the various types of lessons a father and a mother teach. (See: [[rc://en/ta/man/translate/figs-parallelism]])
All three of these mean basically the same thing and are repeated to emphasize the fact that the lessons make life better and easier. AT: "as useful as a lamp ... as helpful as light in the darkness ... as necessary to follow as the way of life" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-parallelism]])