Let’s look at the complexity of human beings as a species or even just one individual.
For one, most adult human beings have roughly 500 trillion chemical synapses, or at least that’s what we’re able to measure at this time (potential chemical connections between neurons and not potential synaptic pathways) and if you consider that in the next few decades or so there will be roughly 9 billion people on the planet, that’s a minimum of 4,500,000,000,000,000,000,000,000 synapses with 9 billion different controllers, each individual possessing a near infinite capacity for variation and almost unlimited action potential, not even accounting for potential interaction with others.
This baseline for interaction and potential among our species alone at least dwarfs the number of atoms that compose everything on earth, (1.33 x 10^500) which is of course a roundabout way of saying that our relationships with each other, or at least the potential that exists, are/is far more complex than we can really ever comprehend and more intricate than any audit of our immediate physical existence.
Also, if we’re taking a physical or material view of things, consider the volume of electrical activity alone and the percentage of atoms that are being moved along these synaptic pathways, as well as the changes to polarity that result thereof.
The way people think is very important, no doubt, and even in a strictly physical sense (read: non-spiritual, philosophical) that’s a lot of physical activity that has to be accounted for.
Essentially this means our potential as a species for variations of cognition, experience, feeling and communication exceeds by far our estimate of the total number of suns in our own galaxy, a measly few hundred billion, to the effect that exploring the thoughts and feelings of our neighbors, even just one of them, is for all practical purposes more of a complicated and cosmic pursuit than sending a satellite to the outer reaches of the galaxy.
We have every right to be vain and every excuse to be concerned with other people and ourselves in light of what we know about the universe. Each person truly contains limitless potential for thought, expression and experience. And from our incomplete understanding of the relation of electromagnetics to gravity/matter on a cosmological scale, even the most skeptical person has to admit that individuals and human beings interact with elemental forces at work in the universe in ways that we cannot yet fully comprehend, even when they just speak to the person next to them for just a single second.
Some food for thought.