grammar - What's the difference between "な感じ" and "という感じ" when written after quotation marks?

な感じ was crossed out and replaced with という感じ in a sentence that I wrote that was similar to this one:

その文には「それは私にはもったいない」 な感じ という感じ があると思う。
I think that sentence has a feeling of "that's more than one deserves."

What's the difference between な感じ and という感じ when written after quotation marks?

Answer

な is the attributive ending of a na-adjective or a noun. The modifier to the noun 感じ in your example ends with ない, which is an i-adjective, so it should not take な.

As Flaw comments, 「～ない」感じ is generally possible, but that has two problems in this particular case. First, 私 will not work as intended. You can use 自分 instead. Second, since the description in the modifier is is made from a non first-person's perspective, it is more natural to insert という. You can go with either:

その文には「自分にはもったいない」感じがあると思う。