When we quarry with future generations in mind, stone becomes a bridge, not just a resource.
你和我各有一个苹果,如果我们交换苹果的话,我们还是只有一个苹果。但当你和我各有一个想法,我们交换想法的话,我们就都有两个想法了。
The only limit to our realization of tomorrow will be our doubts of today.