In plain words
We must recognise the truth that the very Ātma that is in my heart, the very sacred power that is there, is present in the person before me too. Only the mind of one who has recognised this oneness of the Ātma remains pure. To do otherwise, nursing hatred and grudges only in the matters that suit oneself and so turning into a rākṣasa, is contrary to our humanness.
Next, purity of speech. That is, we must speak the truth. We must speak softly and sweetly. We must take up the skill of moving through life without hurting others and without being hurt ourselves. We must not talk too much. We must not speak ill of others. Purity of speech is to rid ourselves of untruth, excessive talk, slander, blame and the evil words that hurt others. Today we are badly fouling our speech. Whenever we look, it is the faults of others that we think about and talk about. We blame others. We talk too much. Not only that: in our words we wield harshness like a sword. These harsh words too add to our impurity. This is not the right path for a human being.
Next, purity of the body. It must be cleansed with water. Only when we practise these four kinds of purity, of things, of mind, of speech and of the body, does the quality called kṣamā find some room to grow. This kṣamā is not something our eyes can see. Once, while they were in the forest, Bhīma and Draupadī came to Dharmaja. They asked him what course they meant to take toward the foes who had become their enemies. Dharmaja smiled at the questions Bhīma and Draupadī put to him, spoke words of peace to them, and said that in truth they had no enemies at all. Our own qualities are our enemies. Our own deeds are our enemies. Our own conduct is our enemy. So, he taught, we must strive to conquer those enemies: evil conduct, evil thoughts and evil qualities. It is our own evil thoughts that are reflected back to us, so that they seem to be in the person before us.