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When someone is self-deluded and you would like to use an expression to tell them to basically look in the mirror and see the truth, what would this expression be?

This person is the type to be extremely narrow minded and only see things their way, even when this is not correct or realistic. This person therefore lies to themselves and lives in a deluded sense. Always thinking that they are right and others are wrong, never wanting to see things for what they are because they don't want to have to admit that they're wrong.

  • It's called "beating your head against a brick wall". You can't convince such a person that they're wrong -- they have to undergo some sort of self-revelation. – Hot Licks May 30 '17 at 2:21
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Wake up and smell the coffee.

something that you say in order to tell someone that they should try to understand the true facts of a situation or that they should give more attention to what is happening around them

It's time you woke up and smelled the coffee, Don. We're just not getting enough business any more.

[Cambridge Idioms Dictionary](http://idioms.thefreedictionary.com/Wake+up+and+smell+the+coffee! )

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TFD(idioms):

get real

to accept the truth and not deceive yourself 
Voters want Congress to get real and pass a bill to revive the economy.

Usage notes: also used as an order:  You expect me to ignore data like that? Get real!

Cambridge Dictionary of American Idioms Copyright © Cambridge University Press 2003. Reproduced with permission.

1

Stop living in fantasy land.

There are a number of variations ("fantasy land" as one word or two, with or without an article, "world" instead of "land").

Various similar definitions: "fantasy land" is an imagined, idealized place. (Collins) To live in a fantasy land is to have ideas or plans that are not realistic. (M-W)

Another variation on fantasy land is "la-la land" (variations in capitalization and hyphenation). These expressions are interchangeable, but a definition for living in la-la land is to think that things that are completely impossible might happen, rather than understanding how things really are. (Cambridge)

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