think carefully and worry about things in distant future ❍ 思深哉！ 其有陶唐氏之遗民乎？不然，何忧之远也。(《左传·襄二十九年》)How expressive of thought and deep anxiety! Did not Tang possess the people that came down from the rule of the prince of Tao and Tang? But for that how should there have been here an anxiety so far reaching?