In plain words
Sorrows keep pursuing joys. A man without joy and sorrow is not to be found in this world.
Hardship and happiness, the two, are joined together; no one has the power to separate them; happiness on its own we shall see nowhere; when hardship bears fruit, they call it happiness.
He taught them to take this truth as a message and proclaim it to the world. If there are no hardships, we do not know the value of happiness. If there were no darkness, we would not understand the value of light. So He gave man both, happiness and sorrow, and went on teaching which of these is of chief importance to man, which is the support, which is transient and which is Asatya. So we must bear hardships. Hardship itself brings happiness. A man who has no hardship at all does not know what happiness is. So we must face hardship and win happiness. We must give it to the world. We must bring happiness to one who has none. Even in every small act of this kind, we must believe it to be the divine message itself, believe it to be the divine ideal, and proclaim the message to the world. Man, you are enjoying so many kinds of happiness in this world. Among all these pleasures, what is the happiness you have recognised? What is the happiness you have achieved, what is the happiness you have enjoyed? What is the happiness you have given to others? If you inquire, nothing comes of it. From birth they suffer many sorrows. But he is unable to recognise the truth that happiness lies in this very sorrow. Which happiness? The happiness of the body? Or the happiness of the mind? Or the happiness of the Ātma? That we must inquire into. They have gone on teaching Śānti. Three times they say Śāntiḥ Śāntiḥ Śāntiḥ. Śānti of the body, Śānti of the mind, Śānti of the Ātma. These three Śāntis are most necessary for man. These three kinds of Śānti are gained by God's Prema. One who is without God's Prema will have no happiness at all. Today people long for many pleasures. But all these are only temporary. This is what Śaṅkarācārya said.