There's a fine line between being sweet and innocent and being a tough broad

The first match is always tough, but they did just fine. Looking at them, I think they'll get better each match.

Life is that perfect fine line between ironies.

There's a fine line between patriotism and corn.

There's a fine line between genius and insanity. I have erased this line.

There is a fine line between something that's gratuitous, that's unnecessary.