What is the "golden rule" of interpretation of statutory words?

[20] In Nokes v. Doncaster Amalgamated Collieries [1940] A.C. 1014 it was stated at p. 1022: The golden rule is that the words of a statute must prima facie be given their ordinary meaning. We must not shrink from an interpretation which will reverse the previous law, for the purpose of a large part of our statute law is to make lawful that which would not be lawful without the statute, or, conversely, to prohibit results which would otherwise follow. Judges are not called upon to apply their opinions of sound policy so as to modify the plain meaning of statutory words, but where, in construing general words the meaning of which is not entirely plain, there are adequate reasons for doubting whether the legislature could have been intending so wide an interpretation as would disregard fundamental principles, then we may be justified in adopting a narrower construction.