At the age of 70, the American poet Walt Whitman said: "Now I understand that the secret of creating a whole man is to let man grow amid nature, living together with the world."
美國詩人惠特曼在七十歲時說過：「現在我明白了，創造完人的秘密，是讓人在自然中長大，與大地一同生活。」