New bathroom mirror covers a junction box

I’m attempting to replace the vanity mirror in my daughter’s bathroom. The old mirror is wired for electric lighting, but the new mirror is just a mirror with no attached lighting fixture.

My question is, when I remove the old mirror, do I simply cap off the existing wiring and the hang the new mirror in place of the old, or do I need to remove the wires completely? It would be nice to keep the existing wiring in case we’d like to add lighting in the future, but my first priority is safety. Any advice would be most welcome.