Emotion is caused by something very dear, by something very detestable, by fire, strong wind, strong rainfall, by some natural disturbance, the sight of a big elephant, or the sight of an enemy. When there is emotion caused by seeing something very dear, one can speak very swiftly and use kind words. When there is emotion caused by seeing something detestable, one cries very loudly. When there is emotion caused by seeing fire, one tries to fly away. There may also be trembling of the body, closing of the eyes and tears in the eyes. When one becomes emotional on account of a strong wind, one tries to run very swiftly and rubs his eyes. When one is emotional because of rainfall, one takes an umbrella, and there is tension in his body. When there is emotion due to a sudden disturbance, one's face becomes discolored, one becomes struck with wonder, and there is trembling of the body. If there is emotion from seeing an elephant, one may jump, show various signs of fearfulness, and sometimes one may keep looking behind him. When there is emotion due to the presence of an enemy, one looks for a fatal weapon and tries to escape.
When Kṛṣṇa returned from the forest of Vṛndāvana, Mother Yaśodā was so emotional from seeing her son that milk began to flow from her breasts. This is an instance of emotion caused by seeing a dear object.
In the Tenth Canto, 23rd Chapter, 13th verse of Śrīmad-Bhāgavatam, Śukadeva Gosvāmī informs King Parīkṣit: "My dear King, the wives of the brāhmaṇas were usually very much attached to the glorification of Kṛṣṇa, and they were always anxious to get an opportunity to see Him. Because of this, when they heard that Kṛṣṇa was nearby, they became very anxious to see Him and immediately left their homes." This is an instance of emotional activity caused by the presence of someone who is very dear.
When Pūtanā, the demoniac witch, was struck down and killed by Kṛṣṇa, Mother Yaśodā was struck with wonder and began to cry emotionally, "Oh, what is this? What is this?" When she saw that her dear baby Kṛṣṇa was playing on the chest of the dead demonic woman, Mother Yaśodā, at a loss what to do, began to walk this way and that. This is an instance of being emotional on account of seeing something ghastly.