I once asked a similar question and got a very good mathematical answer, but I'm trying to find one that doesn't involve equations for a lay person. I have been reading how Einstein had to develop the math to describe curvature before he could put forth his field equations. It seems to me that homogeneous, isotropic curvature can be expressed as the surface area of a 4 dimensional sphere with a certain radius of curvature. From this I am thinking that a change in this curvature caused by mass-energy produces an inverse square law. It is easy to see how geometry gives an inverse square law in Newton's law of gravity. Is this a correct way of thinking?