I think that one not only has to make demands on the established group, but one also has to make demands on the outsider group. One has to make clear: if you want to leave, please do so. But if you want to stay here, a degree of accommodation to the Dutch outlook, Dutch manners, and a degree of identification with the Netherlands will be expected of you. There is no reason why there cannot be Dutch Turks or Dutch Moroccans. But one can expect from them a degree of identification, some change of their own social identity.

The natives of England are closing their doors to relationships with Asians and Africans or, for that matter, Turks and Spaniards. While the Africans and Asians on their part are increasingly closing their doors too and resentment at both sides is increasing. This trend can be dangerous. It can lead, sooner or later, to violence - even in this country, which is traditionally an opponent of violence.

When Benjamin Disraeli spoke of the 'two nations' in Britain he was perfectly right, only the working classes were not exactly a nation. But the gap in behavioral standards and in outlook, and of course in standards of living, were enormous. And in course of time, at least in countries such as Britain, the working classes more or less adopted and have become assimilated to the standards of the so-called 'gentle' classes. That is assimilation.The working class has hardly been able to govern, but they are no longer outsiders in relation to the state as they were before.

Debating the concept of race does not mean that I in any way regard this as a quarrel between neighbors over where they come from. I have perhaps said enough when I said the alternative to assimilation is that immigrant groups form their own state or go away for lack of acceptance. Why should it be less serious if quarrels and dissensions are socially related? After all, the quarrels and dissensions between Russia and America are also not racial. And yet they seem to me extremely dangerous.

Very often people who live in a ghetto accept some of the stigmatisation against them. I mention the case of a Japanese minority the Burakumin, which was pure Japanese in descent, but which was concerned with dirty work: leather work, cadavers, and some other things.There was a famous story of an old man who asked: 'Do you yourself believe you are the same as the Japanese?' And the outsider said: 'I do not know, we are dirty.' This kind of conscience was never there in the surroundings in which I lived. One always felt as someone whom could be proud of, being both German and Jewish.

The heart of assimilation process of absorbing minorities lies in the self-image of a nation. There are, as you will know, big differences for instance between the self-image of the French and the English. And the Germans, in accordance with their rather chequered history, had at least in the past very little capacity for absorbing minorities.

Scientific modes of thought cannot be developed and become generally accepted unless people renounce their primary, unreflecting, and spontaneous attempt to understand all their experience in terms of its purpose and meaning for themselves. The development that led to more adequate knowledge and increasing control of nature was therefore, considered from one aspect, also a development toward greater self-control by men.