[16] A great poet may permit himself, at least in jest, to give utterance to psychological truths that are heavily censured. Thus Heine: ‘Mine is the most peaceable disposition. My wishes are a humble dwelling with a thatched roof, but a good bed, good food, milk and butter of the freshest, flowers at my windows, some fine tall trees before my door; and if the good God wants to make me completely happy, he will grant me the joy of seeing some six or seven of my enemies hanging from these trees. With my heart full of deep emotion I shall forgive them before they die all the wrong they did me in their lifetime—true, one must forgive one’s enemies, but not until they are brought to execution.’ (Heine, _Gedanken und Einfälle_.) [17] Anyone who has been through the misery of poverty in his youth, and has endured the indifference and arrogance of those who have possessions, should be exempt from the suspicion that he has no understanding of or goodwill towards the endeavours made to fight the economic inequality of men and all that it leads to. To be sure, if an attempt is made to base this fight upon an abstract demand for equality for all in the name of justice, there is a very obvious objection to be made, namely, that nature began the injustice by the highly unequal way in which she endows individuals physically and mentally, for which there is no help. [18] Cf. _Group Psychology and the Analysis of the Ego_ (1921). London: Hogarth Press, 1922. VI Never before in any of my previous writings have I had the feeling so strongly as I have now that what I am describing is common knowledge, that I am requisitioning paper and ink, and in due course the labour of compositors and printers, in order to expound things that in themselves are obvious. For this reason, if it should appear that the recognition of a special independent instinct of aggression would entail a modification of the psycho-analytical theory of instincts, I should be glad enough to seize upon the idea.