"The jealous attitude is manifested most strikingly in children from the fifth year on, in situations where competitors seek to exalt themselves in the eyes of those who have favours to distribute, or where the deeds and virtues of rivals are extolled by outsiders. Let K. begin to describe in the family circle some courageous or faithful deed he has performed, or painful experience he has endured, or duties he has discharged, and C., his natural rival, will at once seek to minimise the importance of the particular act for which praise is sought, so that K. may not be too highly thought of. Then C. will endeavour to attract attention to his own worth by describing more meritorious deeds which he has himself performed. He cannot easily submit to the attempts of his rival to gain the admiration of the company before whom he wishes to exhibit himself. But it is different in situations where K. and C. are united in their interests, in opposition to other groups. Then C. is glad to reinforce the testimony of K. regarding his valorous deeds; and the principle works in just the same way when C. is seeking for favour, and K. is the jealous witness or the faithful comrade. "It must be impressed that jealousy is an attitude assumed only by individuals in those situations in which they are competing for the same favours. Two children may be intensely jealous in their own homes; but they may abandon this attitude absolutely when they go into the world and compete as a unit with other groups. Normally, the jealousies between members of a family tend to disappear in the measure that their interests broaden, and they form new connections in the world. That is to say, according as persons cease to be keen rivals, they tend either to become indifferent to the successes of one another, or they may even rejoice in the good fortune of each other, and lose no opportunity to celebrate one another's virtues and merits. This latter stage is not reached, however, until rivalry, and so conflict, wholly ceases, and the contestants come to appreciate that their interests are mutual, and each can help himself best by extolling the other. This is frequently seen in adult life, especially in political and professional partnerships....