Proverb giving a clue to this puzzle - Answers with 21 Letters

Question:

Proverb giving a clue to this puzzle

Answer:

INROMEDOASTHEROMANSDO

Length:

Similar Crossword Questions:

"___ is completely over" (baffling statement made by Prince on 7/5/10 that also serves as a clue how to find four answers in this puzzle)
Valley girl's "yeah, right" [IMPORTANT: SEE THE 'NOTE' (above) for key info about this week's puzzle and SEE THE LAST CLUE DOWN for the explanation of last week's puzzle.]
Home-field advantage in football ... or what the last square of the answer to this clue represents in this puzzle
TV feature, and a clue to six other answers in this puzzle
Intrepid [Editor's note: This clue appears in heavier type (without the asterisks) in the print version of the puzzle. AcrossLite can't handle that, so just imaging that it's written in darker type.]
First clue in this puzzle
What this puzzle might be giving you
Clue for this puzzle's four longest answers
Spin, as a cue ball, and how to answer each starred clue in this puzzle?
Clue for four puzzle answers
The only grading letters that appear anywhere in this puzzle (other than the present clue)
Like each answer in this puzzle - also each word in each clue - in length
"That's my cue!" (fun fact: I inadvertently stole this clue from my own NYT puzzle)
Clue to this puzzle's theme
Dictionary source for each asterisked clue in this puzzle
Clue for the four longest answers in this puzzle
School phrase with a clue to this puzzle's theme
Some sewing machines (and clue to this puzzle's theme)
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State after being coldcocked (and a clue to this puzzle's theme)
"Forget it!" (and a clue to this puzzle's theme)
Big fight, and clue to this puzzle's theme that begins the four longest answers
Start of a proverb about consequences ... and a hint to this puzzle's theme
Name that would be super easy to clue if this puzzle were in Korean