In plain words
We must also keep reciting the threefold canon, the Bhagavad Gītā, the Upaniṣad, the Brahma Sūtra and the rest. We must also acquaint ourselves with the sacred scriptures of religion. We must keep reading some sacred book or other. By this we can clear away something of the dirt that has gathered in our mind. Then the fifth, Īśvara-praṇidhāna. Whatever we do, we must perform actions that please God. “Is the work I have done pleasing to God or not? Will God be satisfied by these actions or not?”: inquire so in every action, and perform only those actions that please God. God means your conscience. You must never do any work that does not satisfy your Ātma. Your own heart keeps punishing you in every way. If it is not work that satisfies, your own mind reproaches you. You must develop the right feeling in the works you do, so that your Ātma is satisfied. This is what Vedānta called sarva-karma bhagavat-prītyartham. Only when you perform actions that are pleasing to you will they bring you good. Only when we keep both these, yama and niyama, shall we be people who have fulfilled the four goals of life. We shall be people who have practised the good disciplines of śama, dama and the rest.
In the students of today these human values called yama and niyama are not to be seen at all. That is why the whole heart of today's students is filled with dirt. Students must become pure of heart. They must shape themselves into the citizens of the future. All the good and bad of the country depends on students alone. In every field, students above all must excel. In moral, physical, religious, spiritual and worldly knowledge, students must shape their influence in a sacred way. We must also try to practise śama, dama and the other disciplines. Śama means to restrain mind and intellect and try to keep our affairs under control. These are the working of the inner senses. Only when the working of the inner senses is checked will the outer senses naturally stay under our control. The organs of action and the organs of knowledge are the outer senses. Whatever we see, we must see as good. We must not see what is bad. What you hear, you must hear the good; you must not hear the bad. Every word you speak must be a good word; you must not speak hurtful words. The thoughts you think must also be good; bad thoughts must not arise in us. All the work you do must be good work. It must be work that is an example to everyone. This is the working of dama. That is it: See no evil. See what is Good. Hear no evil hear what is good. Talk no evil, talk what is good. Think no evil, think what is good. Do no evil, do what is good. This is the way to GOD.