Another important factor is _pain_, pain that the person we love has ceased to love us. When we love a person and our love is not reciprocated, we feel pain which may rise to the degree of agony, even when there is no rival in the field. But when a person who loved us has ceased to love us--or we imagine so--and has transferred the love to another person that pain is so much the greater. I will digress here for a moment to state that the fear that a person has ceased to love us because he loves somebody else is often groundless. It is based upon the erroneous and vicious idea that a man cannot possibly love two women at the same time, or that a woman cannot love two men at the same time. Psychologists, particularly those who have made a special study of sexual psychology, know that this idea is false. They know that love may be directed at the same time towards two or three individuals. They know that a second love not only does not necessarily destroy or diminish a first love, but may deepen and strengthen the latter. Another element is pure _envy_. Just mean envy that somebody should have what we haven't, or what we have but are in danger of losing. Just as we envy others an automobile, a fine house, a high social position, etc., when we have not got them or have been deprived of them. A point that I would like to mention is, that if husbands who have become impotent--having lost either the desire or the power, but particularly the latter--become jealous, their jealousy knows no bounds. No strongly potent man ever reaches the same intensity in jealousy as is reached by a sexually weak or impotent man. The knowledge that another man has displaced him and that he himself could not replace that other man _even if he were permitted to_ fills him with impotent rage; and, as is well known, impotent rage is always more intense than rage that is potent. Women are free from this kind of rage, because women are never impotent in this sense. (They may be frigid, but they are never devoid of the _potentia coeundi_, except in extremely rare cases of _atresia vaginae_ or the absence of the external genitals.) There are a number of other components which go to make up this "queen of torments" or "king of torturers" jealousy, but those I have enumerated are the essential ones. What are they? Fear, vanity, anger, envy and pain. None of them admirable qualities, none of them, with the exception of the first and the last, even deserving our compassion. All of them anti-social and anti-individual qualities. Should not everything be done to eradicate such a rank weed, which draws its sustenance from roots each one of which is dipped in poison?