The ultimate growth is to say yes with such joy as a child says no.
That is a second childhood. And the man who can say yes with tremendous freedom and joy, with no hesitation, with no strings attached, with no conditions
a pure and simple joy, a pure and simple yes - that man has become a sage.
That man lives in harmony again. And his harmony is of a totally different dimension than the harmony of trees, animals and birds. They live in harmony because they cannot say no, and the sage lives in harmony because he does not say no. Between the two, the birds and the buddhas, are all human beings - un-grown-up, immature, childish, stuck somewhere, still trying to say no, to have some feeling of freedom.