Quem cedo e bem aprende, tarde ou nunca esquece. Quem negligencia as manifestações de amizade, acaba por perder esse sentimento.
Amigos verdadeiros e família genética são difíceis de distinguir!
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Both for my wife and myself, the personal friendships that have grown out of scientific contacts with colleagues from many different countries have been an important part of our lives, and the travels we have made together in connection with the world-wide scientific co-operation have given us rich treasures of experiences.