唯一不变的是变化本身。
The only thing that is constant is change.
The ability to associate depends, in turn, on the degree to which communities share norms and values and are able to subordinate individual interests to those of larger groups.
"Die Vergangenheit ist nie tot, sie ist nicht einmal vergangen."
可持续性不是一种选择；它是负责任农业的唯一前进道路。