"I'm not perfect, but I'm trying every day to concentrate on being better."

Three grand essentials to happiness in this life are something to do, something to love, and something to hope for.

解析：天地之所以能长久存在，是因为它们的一切运作都不为自己，所以能够长久。

Education is the foundation of sustainable forestry—people protect what they understand.

Validate your thoughts through actions.

Hunger and poverty are the root causes of much of the world's unrest and misery.

After climbing a great hill, one only finds that there are many more hills to climb.