What is the meaning of Henry Kissinger's phrase about Germany being "too big for Europe but too small for the world"?

I discovered this sentence through @nighdrot, and I wonder what it means in concrete terms?

I mean Germany since its unity was created in the 19th century, has almost dominated the world twice, and today in the purely economic field it is the 4th, with a population of 80 million inhabitants while the countries in front of it have a much larger population, which makes the economic performance of Germany even more incredible.
What is the meaning of Henry Kissingers phrase about Germany being too big for Europe but too small for the world?
What is the meaning of Henry Kissinger's phrase about Germany being "too big for Europe but too small for the world"?
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