可持续性不是一种趋势，而是我们对后代的责任。

人类思维能够理解宇宙，因为它是宇宙的一部分。

可持续林业不是一种选择；它是一种义务。

"To lose one parent may be regarded as a misfortune; to lose both looks like carelessness."

We have forty million reasons for failure, but not a single excuse.

The only way to get rid of a temptation is to yield to it.