I dont understand this sentence, can you translate it
Antike Philosophen erklären das Glück zum Ziel allen menschlichen Lebens und zerbrachen sich den Kopf über den Weg dorthin.

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This sentence is pretty tricky but its content is nice :D :
Philosophers from the ancient world declare that fortune/happiness is the aim of every human being and, themselves, they wracked their brains about how to get there.

So basically what it means is: Even a thousand of years ago people knew that happiness is the key to everything but nobody knew how to achieve happiness.

Não perca a oportunidade de aprender uma língua no conforto da sua casa. Navegue pela nossa seleção de professores de línguas experientes e inscreva-se na sua primeira aula agora mesmo!