[Avodah] All transgressions are sins?

[Daniel Eidensohn]

kennethgmiller at juno.com wrote:
> R' Daniel Eidensohn asked:
>   
>> I am looking for a clear source that every transgression
>> of a negative comandment is a sin which requires teshuva.
>> ...
>> Where does it say that violation of every negative
>> commandent constitutes a sin which causes spiritual
>> degradation that requires teshuva? Obviously a negative
>> commandemnt means don't do it. But is it a spiritual
>> blemish?
>>     
>
> I can't imagine what could possibly lead someone to think that one might violate G-d's Word and not have to apologize to Him for it.
>   
There are a number of authorities who claim that the Rambam holds that 
there is no Torah obligation to do teshuva

See Netziv to Devarim(30:11),Avodas HaMelech, Minchas Chinuch #364. 
There is also an interesting question that if there is a positive 
commandment of teshuva associated with every violation then how can 
there be malkus [See Frankel Rambam index to Hilchos Teshuva]

> "Is it a spiritual blemish?" How can it NOT be? Maybe we need to define our terms. I've been led to understand that a "spiritual blemish" is something which separates me from the Source of sprituality. It seems to me that disobeying Him would meet that criterion.
>
> "Where does it say...?" -- Lamah li k'ra? Sevara hu!
>
> Please forgive me if any of the above sounds flippant and insulting. I do not mean to insult the question nor the questioner. My intention, rather, is to underscore how very basic this quesion is, and to remind everyone (myself included) that it is the most basic questions which tend to have the most difficult answers.
>
>   
It is so obvious - so why doesn't anyone say it? Either because it is 
too obvious or because it is not true! I have heard the "proof" that it 
is obvious -  but not everything that is obvious is passed over in 
silence. As you point out I am dealing with the most basic theology - so 
why doesn't someone say it? Furthermore we are dealing with rather 
circular reasoning. Since it obviously causes a blemish when 
transgressing G-d's word it requires teshuva. Where does it say that 
every transgression causes spiritual blemish and where does it say that 
every transgression requires teshuva?

It is either obvious that one must do teshuva or that teshuva is 
optional. I am going one step beyond that by asking whether sometimes 
teshuva is not needed for a transgression because not every 
transgression is a sin.

To repeat my question. Where is it stated that every transgression is a 
sin that causes spiritual damage which requires repentance?

Daniel Eidensohn