Hm, it is interesting to think about those 'universal laws.' And I don't know why we prefer to say 'give to receive' and not the other way around. I think it must work the other way around, although the energy might be different. But then again, we need both, negative and positive to move forward.

Although, I think the pendulum actually never swings back equally. That can also be technically explained. But I agree with the point.

I have a restless mind and always seek for blindspots and details overlooked. I love the pendulum analogy.

But I was just thinking that eventually it stops, because a part of its energy trasforms to other types of energy, for example friction. And it cannot go on definitely. Now, (how) can I transform that analogy to that giving topic?

What you wrote about pendulum sounds almost like a timeless proverb. And I love it.