What we have done, the result of that comes to us whenever it comes, either today, tomorrow, hundred years later, hundred lives later, whatever, whatever. And so, it's our own karma. That is why that philosophy in every religion: Killing is sin. Killing is sin in every religion.
Maharishi Mahesh Yogi
Karma is experience, and experience creates memory, and memory creates imagination and desire, and desire creates karma again. If I buy a cup of coffee, that's karma. I now have that memory that might give me the potential desire for having cappuccino, and I walk into Starbucks, and there's karma all over again.
Deepak Chopra