In any weather, at any hour of the day or night, I have been anxious to improve the nick of time, and notch it on my stick too; to stand on the meeting of two eternities, the past and future, which is precisely the present moment; to toe that line.
You will pardon some obscurities, for there are more secrets in my trade than in most men's, and yet not voluntarily kept, but inseparable from its very nature.
–Henry David Thoreau
from Economy, 1854
Quantum mechanics teaches us not to think about the world in terms of “things” that are in this or that state but in terms of “processes” instead.
A process is the passage from one interaction to another.
The properties of “things” manifest themselves in a granular manner only in the moment of interaction—that is to say, at the edges of the processes—and are such only in relation to other things. They cannot be predicted in an unequivocal way, but only in a probabilistic one.
This is the vertiginous dive taken by Bohr, Heisenberg, and Dirac—into the depth of the nature of things.
Reality Is Not What It Seems: The Journey to Quantum Gravity