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Read this on an fb page.

"君はもっと自分の 声の凄さを知るべきさ..."

Does it mean "Like I need to know more in how great your voice is."? Or "Like
you need to know more in how great your voice is.""

Am I right in assuming "知るべき" describes how great her/his voice is?
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2019-08-13T05:57:25.390
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translation
What does "知るべき" mean in the end of this sentence?
べき is "should". See: [How to use べき ( =
beki)](http://maggiesensei.com/2015/05/26/how-to-use-%E3%81%B9%E3%81%8D-beki/)

Therefore 君はもっと知るべきさ is "You should know more". さ is a sentence-end particle.
And the object of 知る, marked with を, is 自分の声の凄さ, "the greatness of the voice
of yours".

> 君はもっと自分の 声の凄さを知るべきさ。  
>  You should know the greatness of you voice more.  
>  You should be more aware of how great your voice is.
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2019-08-13T07:24:41.760
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No, it's not like you say. 声の凄さ is the part where the voice is described as
great. 知るべき means "(you) should know/understand".

> 君はもっと自分の 声の凄さを知るべきさ...

My understanding by reading this sentence without context, is as follows:
someone (the listener) has a great voice but maybe he/she is not
aware/underestimates his/her ability. Therefore, the speaker tells him:

> You should know/understand more (be more aware of) the greatness of your own
> voice

Basically the speaker is telling someone that he/she has a great voice but
doesn't seem to realize it.

You _should_ look more into べき, for example
[here](https://japanesetest4you.com/flashcard/learn-
jlpt-n3-grammar-%E3%81%B9%E3%81%8D%E3%81%B9%E3%81%8D%E3%81%A0-bekibekida/). In
two words, is a way of expressing "should" in English.

The basic construction is: Verb-dictionary form + べき/べきだ (with exception for
する => すべき/するべき).

Simple example: 約束は守るべきだ (you should keep your promises).

Final note: the ending さ is a colloquial way to make a statement more
assertive. See for example [this
question](https://japanese.stackexchange.com/questions/1895/ending-a-sentence-
with-%E3%81%95).
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