Is this a proverb?

We were walking along, when Mrs YesBut turned to me and said "If wishes were horses, man could fly".

I asked, "where did that come from?".

She said she didn't know.

Googled the phrase, while there are similar phrases, nothing exactly the same.

Can you help by providing an explanation?

I'm baffled - though that's nothing new, Mrs YesBut frequently confounds me.

Bad taste

Two weeks ago I attended a private viewing at an art gallery. When leaving guests were presented with a small box containing four very exclusive handmade chocolates.

Lying in bed last night I asked Mrs YesBut, "where are the chocolates?"

"What chocolates?"

"The ones I brought home two weeks ago"

"Oh those, I ate them"

"When?"

"Last week"

"You didn't offer me one"

"No I put them in a sandwich"

"Did you say sandwich?"

"Yes"

"A sandwich!"

"Yes why?"

"No, nothing, but a sandwich. What did they taste like?"

"I could only taste the achar"

"Wait, your telling me you made a sandwich out of handmade chocolates, which you covered in garlic tasting, hot spicy peppered, mustard oil soaked gunk!"

"Yes, what's wrong with that?"

"Goodnight dear".