Oops! Got the entire quote wrong. Sorry.
As far as what it means goes, I think it is simply a witty remark.
Lord Darlington. Well then, setting aside mercenary people, who, of course, are dreadful, do you think seriously that women who have committed what the world calls a fault should never be forgiven?
Lady Windermere. [Standing at table.] I think they should never be forgiven.
Lord Darlington. And men? Do you think that there should be the same laws for men as there are for women?
Lady Windermere. Certainly!
Lord Darlington. I think life too complex a thing to be settled by these hard and fast rules.
Lady Windermere. If we had 'these hard and fast rules,' we should find life much more simple.
Lord Darlington. You allow of no exceptions?
Lady Windermere. None!
Lord Darlington. Ah, what a fascinating Puritan you are, Lady Windermere!
Lady Windermere. The adjective was unnecessary, Lord Darlington.
Lord Darlington. I couldn't help it. I can resist everything except temptation.
Lady Windermere. You have the modern affectation of weakness.
Lord Darlington. [Looking at her.] It's only an affectation, Lady Windermere.
~Lady Windermere's Fan, by Oscar Wilde
http://www.classicbookshelf.com/library ... e_s_fan/0/