The only limit to our realization of tomorrow will be our doubts of today.

The gratitude of every home in our Union goes out to the brave men who have fought and died in the service of our country.

The act of writing is an act of survival.

To be what we are, and to become what we are capable of becoming, is the only end of life.

渔业的创新必须平衡生态和经济。

在数学中，提出问题的艺术必须比解决问题更有价值。