一本天書讀到老 how to say when translating into english?

對等的英文譯法我不清楚.意譯的話可以譯為:
Apply one single principle/rule/doctrine/standard to all situations.

A book which you can refer to, no matter how old you are.

A book which you can refer to, for life!

read the sky book to old 　

A book from heaven reads old