Throughout history, we have stretched our limits of perception from the narrow band of light the human eye can see to the wide spectrum of reality that our technology can see. With telescopes looking outward further and further, and microscopes looking inward deeper and deeper, we have managed to expand how much of reality we can perceive so substantially that we have revolutionized the way we see and interact with the world and began to assume that we can detect it all.
The Greek word atomos, meaning "not cut", was used to describe the concept of an elementary building block; an indivisible level of the universe that all else is built upon. Since then, we have learned that what we call the atom is divisible into smaller components. However, we still make the same mistake: we interpret that our technology's limit of perception is the limit of reality.
Logically, using purely pattern inference, we can look upward at the sky and see that the moon orbits the Earth, which then orbits the sun, which then orbits a supermassive black hole, which implies this pattern should continue where our galaxy orbits another larger mass, which orbits another larger mass, ad infinitum. Just the same, it is only logical that this pattern continue infinitely in the opposite direction; that there be infinitesimal particles.
With gravity alone, this pattern of infinitesimal through infinite particles is what manifests as the universe as we know it. Everything else is an effect of this root cause, including the particles themselves since their infinite building blocks are held together by gravity. In this, there is only gravity and thereby: All is One, One is All.