The definition of “catholic” is, “the church anywhere is the church everywhere.”
But here’s a more poetic way of saying it.
You are not a single drop of water in the ocean, you are the entire ocean in a single drop of water.
Written by Rumi, a 13th cent Sufi mystic poet.
My one caveat is that this can be easily read as referring to an individual. But individuals are not the Church. The Body of Christ is inherently corporate.