Causal cycle? Believe it or not?

If you scold you, people will scold you; if you help others, people will smile at you; if you feed the dog, the dog will wag its tail to thank you. Lei Feng is famous all over the country for helping people. Brother Biao earned 1 yuan and donated 5 yuan. He is now a billionaire. This is cause and effect. Even a wall, if you hit the wall, the wall will give you a reaction. You don't need a third life, you can know it in this world.