"Immigration from foreign civilizations creates more problems than it can bring us in terms of positive factors on the labor market. Immigration from related civilizations, for example from Poland, is problem-free. From the Czech Republic, for example, is no problem. From Austria, for example, is no problem. From Italy is no problem. It starts with somewhat more eastern regions. Immigration from Anatolia, for example, is not entirely problem-free. Immigration from Afghanistan causes considerable problems. Immigration from Kazakhstan causes problems. These are other civilizations. Not because of their different genes, not because of their different ancestry, but because of the way they were brought up as infants, as toddlers, as schoolchildren, as children in the family."
January 1, 1970
https://en.wikiquote.org/wiki/Helmut_Schmidt