In plain words
That is, He told you to take refuge in yourself. Those who understand this truth can recognise that whatever they do, good or bad, they do it to themselves and not to others. ‘Tam eva’: He told you to take refuge in that very principle of yours. It is the form in which what ‘tat’ means and what ‘tvam’ means are blended into one. It becomes quite clear that the union of these two is what it is to be human.
Dharmakṣetra is the very seat of the Ātma
At the start of the Bhagavad Gītā, Dhṛtarāṣṭra begins with the words ‘Dharmakṣetre kurukṣetre’. What does Dharmakṣetra mean? Dharmakṣetra is the very seat of the Ātma! As for Kurukṣetra: it is this body, which makes one commit sinful deeds, that bears the name Kurukṣetra. So we must understand that Dharmakṣetra is the Ātma and Kurukṣetra is the body, and that the human body is this form of consciousness in which the Ātma and the non-Ātma are blended. This is human nature as it stands in the form of kṣetra and kṣetrajña. But forgetting today this divine, splendid, ever-new humanness, unable to understand what svadharma is and what paradharma is, man is in some measure wasting his time.
Casting off svadharma and putting his faith in paradharma, empty of any inquiry into what is true and what is untrue, man falls prey to unrest. The root cause of all the hardships, sorrows and griefs he suffers is that he leaves svadharma, the Dharma of the Ātma, and follows the dharma of the body! Caught in the wheel of time that is desire, anger, greed, pride and envy, man falls into many hardships. He forgets the truth that he is the very form of Satya. He loses sight of the principle ‘the Satya of Satya’. He forgets, too, that he is not only Satya by nature but one who thirsts for Ānanda. It is because he has lost sight of this truth that man does not grieve over what he should grieve over, and grieves over what does not deserve grief. In the eleventh śloka of the second chapter, Kṛṣṇa taught this in many ways.