When you realize you are the atman, law of karma will not work. You are not the doer. That is freedom. The movie will not stop. The world will go on. This body will go on to its inevitable end. With the senses, he will experience, and with the hands and feet he will act. And yet, in the midst of all of this, you are free. So that is the meaning of this wonderful mantra here. It denies alienship and uh uh expedients.You are neither the um subject of action nor the object of action. Hence, neither the good actions nor the bad actions tamatea will have any effect on you.
Swami Sarvapriyananda teaches the Katha Upanishad, one of India's most revered texts which is also a part of the Vedas. It is a collection of philosophical poems representing a conversation between the sage Naciketas and Yama (god of death). They discuss the nature of Atman, Brahman and Moksha(liberation).