But freedom is one thing, advisability quite another.

　　但自由是一回事，明智則完全是另一回事。

　　Advisability means to gain the best goal with the best method.

　　明智指的是用最好的辦法去追求最好的目標。

　　The criteria for judging advisability of reference frame obtained with the two methods are given.

　　對這兩種方法所采用的參考框架的合理性給出了判別準則。

　　The new approach had wide applicability to all sorts of different problems.

　　新方法廣泛適用于解決各種各樣的問題。

　　As a source of knowledge the strength of rational statements lies in reliability and predictability, but not in breadth or applicability.

　　作為知識的來源之一，理論敘述的作用在于可靠性和預見性，而不在于廣泛性和實用性。