It’s the law of cause and effect, the universe is based on fair exchange- what you give, you will get. What you send out, will come back. What you sow, you will reap. What you see in others exists in you. Keep it positive, speak good words, think good thoughts, do good deeds. Whether we act honestly or dishonestly, help or hurt others, It all gets recorded and life will let you get away with something for a while, but sooner or later, it will come back to you.