1) An object at rest stays at rest unless something pushes it, and a moving object continues moving along its course at the same speed unless something pushes it. (The Law of Inertia)

2) If an object gets pushed on, it speeds up in the direction of the push. It accelerates faster for harder pushes.

3) If object A pushes object B, then B pushes back equally hard on A. This is why you feel pressure on your hand if you press a wall; your hand and the wall are pushing on each other equally hard.

These descriptions aren’t obviously true. Aristotle, for example, rejected the Law of Inertia; he thought that the “default behavior” of matter on earth was to come to a stop and rest on the ground. But these statements at least paint a plausible picture of how the world might be, and Newton’s Laws are just codifying these English descriptions into more precise mathematical ones.

But quantum mechanics isn't like this at all; like Newtonian mechanics it can be described in either math or English, but unlike them it doesn't describe any picture of physical reality that you can wrap your head around. Taken at face value scientists would laugh quantum out of the room; they only grudgingly accept it because it is more accurate than anything else we have. The equations have to be treated as purely mathematical objects, without any physical picture underlying them (although if you're willing to make this leap, you're rewarded by the fact that as mathematical objects go they're fairly straightforward). Some of the greatest minds of the 20th century have labored in vain to paint an intuitive picture of quantum mechanics, and it has come to nothing. What does this mean? It could be that there’s a more reasonable theory underlying quantum mechanics, and we just haven’t found it yet (though there are reasons to believe that no “reasonable” theory could give rise to something like quantum). It could also mean that the fundamental principles of the universe simply aren’t conceivable to the human brain - when you think about it, even getting as far as we have (subatomic particles, the age of the universe, etc.) is pretty impressive for a bunch of bipedal apes.