Through our actions we sense the world and know something about it. Comprehension comes from finding in our full real lives experiences comparable to what we sense of the universe.
We need to develop what we are capable of to comprehend how energy functions through matter. Energies of the universe come together through mass as gravitational interactions.
Newton described this universality and provided the means by equations of motion to access the energy changes involved. Interchanges of all matter into masses in motion is what really happens.
Through Einstein’s representation a wider selection of energy change is accessible. Energies interchanges of the whole universe coming together through all masses in motion provides a way of comprehending what is happening with gravity.