• Is the purpose of theoretical physics to be no more than a cataloging of all the things that can happen when particles interact with each other and seperate? Or is it to be an understanding at a deeper level in which there are things that are not directly observable (as the underlying quantized fields are) but in terms of which we shall have a more fundamental understanding?

    Julian Schwinger (2013). “Quantum Mechanics: Symbolism of Atomic Measurements”, p.25, Springer Science & Business Media