To warm up, I'll provide my considerable insight for these well known saws; you'll get the idea.
When it's said - "To err is human, to forgive is divine." (Alexander Pope)
What it means - Only a fool would do that; fortunately, I'm not a fool.
When it's said - "A stitch in time saves nine." (Thomas Fuller)
What it means - Your planning skills are non-existant.
When it's said - "Neither a borrower nor a lender be." (William Shakespeare: Hamlet - Polonius, Act 1, Scene 3)
What it means - No.
Now, let's get to more contemporary examples:
What it means - Your check is in the mail.

What it means - I hope to God this IS a beauty contest.
What it means - The freak show industry remains a strong career path.
When it's said - "You know, I'm a television personality. It's not like I'm a famous hooker or something." (Nancy Grace)
What it means - .....you know, I think she said exactly what she meant.
What it means - I'll do anything for money.
What it means - I know where your entire family lives.
That's enough for now drumsticks; you're now imbued with insight far beyond your station. Until next time, I'm out here on the ledge - loving the view.....
- est sicut scienta ad collegium me -