This world exists according to a singular, fundamental principle which is that a thing that comes into existence once makes results on the basis of what is inside of itself from the past, and makes itself exist continuously by repeating its activities endlessly. A thing's very activities become the cause through which it makes itself come into being in the future.
So, seeing the world from this principle, we can find two or three laws: The law of cause and effect, and the law of existing by changing through activities (repetition). Rather than coming up with theory and finding evidence, we can take any sample from the entire world and verify this theory as their method of operation.
(If you're wondering about the question of infinitely regressing this statement to the origin of the world, I can say that the same explanation applies. The world itself also repeats (ends and begins again) periodically and also displays the entire process of evolution according to the law of cause and effect.)
When people really understand this principle and see things in the world on the principle, they come to realize the fundamental problem in physics is gravity. People don't really understand what general relativity means. It's sort of like how most people don't know that Schrödinger was joking when he talked about not knowing if the cat would be alive or dead. That's why physics has gone on a massive detour over the last 100 years. Unless physicists solve the problem of gravity, humanity won't be able to recognize the cause of and survive through the collapse of the Earth's ecosystem. Things are more serious than people realize - even after all these years. It sounds fantastical to people who haven't confirmed, but what I point out here is undeniable after confirmation of facts. So, from one perspective, it's as if physicists don't have the willpower or courage to admit the reality of the situation today, which is what fundamentally prevents them from pursuing the way to confirm about gravity - it would result in them confronting today's reality. Realistically, it's a hard burden for anyone to bear. That's one of the reasons why a person who says what I say here is rarely welcomed.