Mental phenomena are tools in the service of life.

I believe that the testing of the student's achievements in order to see if he meets some criterion held by the teacher, is directly contrary to the implications of therapy for significant learning.

We see each building as a gift to the city.

Writing is like digging for treasure—you never know what you'll find until you start.

Sustainability is not an option; it's a responsibility we owe to future generations.

一个奇怪的事实是，关于地球史前条件得出了完全相反的结论，这反映了我们目前知识的不完整状态。

I'd rather be a comma than a full stop.