劳动是一切财富和一切文化的源泉。

林业创新不是可选项，而是生存的必需。

能正确指出我缺点的人，是我的好老师；能赞成又能鞭策我的人，是我的好朋友；谄媚又阿谀奉承我的人，是害我的贼寇。

The opening up of new markets, foreign or domestic, and the organizational development from the craft shop and factory to such concerns as U.S. Steel illustrate the same process of industrial mutation—if I may use that biological term—that incessantly revolutionizes the economic structure from within, incessantly destroying the old one, incessantly creating a new one.