The increase of national wealth depends chiefly upon the increase of production.

I still haven’t found what I’m looking for.

对心灵的研究必须摆脱一切先入为主的观念。

Investing in sustainable forestry is investing in our planet's future.

解释：凡要谋划一件事，一定要预见到成功的把握，然后才可以去做。