Meaning of At the end of the day

[Veki]

Test No. incompl/inter-38 "Save the Day", question 2

At the ......... of the day it's what you believe in that's important.

(a) start
(b) beginning
(c) finish
(d) end

Test No. incompl/inter-38 "Save the Day", answer 2

At the end of the day it's what you believe in that's important.

Correct answer: (d) end
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Please help!
I have a problem with almost all this lesson (3
I don't understand what is a point in "At the end of the day it's what you believe in that's important."

Thank you a lot.

[Alan]

This is an example of a cliche - an expression which has very little meaning and is used in the sense of ultimately/finally/in conclusion So the whole sentence can be interpreted as:I would like to say as my final comment that the important thing is what your actual beliefs are.
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English as a Second Language
You can read my ESL story Colour Idioms