In his purport to Srimad Bhagavatam, Canto 4, Chapter 9, text 44, Srila Prabhupada describes the temperature of human tears, a phenomenon seldom discussed or referred to, even in physiological circles. Herein he writes: "By nature's way, when a man cries, there may be two causes. When he cries in great happiness upon the fulfillment of some desire, the tears coming forth from the eyes are very cold and pleasing, whereas tears in times of distress are very hot." This phenomenon is also described in Srila Prabhupada's Nectar of Devotion, Chapter 28, called "Existential Love." The passage reads: "Out of jubilation, anger or separation there may be the pouring down of tears from the eyes. When such tears are very cold they are due to jubilation, and when they are due to anger the tears become hot. In all cases there is a severe movement of the eyes, and the eyes generally become reddish. There is also an itching sensation which causes the sufferer to rub his eyes."