Man's survival, from the time of Adam and Eve until the invention of agriculture, must have been precarious because of his inability to ensure his food supply.

我知道必须让孩子们有所专心，怠慢乃是孩子们最可怕的危险。

The only limit to our realization of tomorrow is our doubts of today.

文学是一种治愈，是对心灵的抚慰。