Well according to Tolkien, even if you try to preserve the world in any way (conservation) you are doing an evil act. You are trying to delay the Purposes Eru has planted.

So I suppose at least you agree that Morgoth was evil at the least?

Yes. Morgoth only pretended to plea for pardon in front of the Valar. We know this becuase what did he do as soon as he was sent out? Cause lies amoungst the Eldar in Valinor and then smite the Tree's of Light.

Sauron we know truly repented for his evil after the downfall of Morgoth but would not go with Eonwe to Valinor out of shame..

Very well. So your not even going to give a tiny bit of you opinion about the matter TM? It seems a bit strange why not.

So Beren, Mos111 and Avantguardian, anything more to add or is it concluded?

Good to see you Lord Lorien.

So you think Morgoth is no more irrational than Sauron? Here is a quote:

"This was sheer nihilism, and negation its ultimate object...Sauron had never reached this stage of nihilistic madness".

So This proves that Sauron had not reached the destructive madness Morgoth had. He was not as Irrational in simple terms.

All rational minds / spirits deriving from Eru are 'equal' - in order and status - though not necessarily 'coëval' or of like original power."  - WHERE does it say here that no being can ever TURN irrational??? It merely staes that all beings are rational originally if the derive from Eru.

All rational minds / spirits deriving from Eru are 'equal' - in order and status - though not necessarily 'coëval' or of like original power."

This is perfectly agreeable. Melkor was Rational originally and to enhance that we have this:

originally when he was capable of rational thought...

BUT Tolkien clearly doesn't think of Rationalbility to be something that one can't change becuase we have then this quote again -

He was aware, at any rate originally when he was capable of rational thought , that he could not annhialate them {Elves and Men]

So Melkor and all other beings which derive from Eru = Rational

No mention that Rationalbility is a state of being and cannot be changed becuase by the quote above Melkor was clearly Irrational.

Simple as that. You have been trying to twist this all out of context Narguzir - what i said above is the only one way which it is.

Do NOT tell me that I am the one twisting things out of context.

The quote that you keep sticking to--the one that says that Melkor became incapable of rational thought--uses the world rational in a DIFFERENT SENSE than than the one used in both the Letters quote and the Morgoth's Ring quote that I provided.

Lord Lorien said it nicely here:

Lord Lorien wrote:

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mos, you're trying to use this quote to show that Morgoth was irrational therefor is more evil than Sauron:
He was aware, at any rate originally when he was capable of rational thought , that he could not annhialate them {Elves and Men]
This has nothing to do with rational beings.  A rational being does not have to be capable of rational thought.  Just because Morgoth became incapable of "rational thought" does not mean that he wasn't a "rational being."  A rational being, according to Tolkien, has nothing to do with the "inability to think rationally," but beings that come from Eru.  

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As Narg said you are thinking that a rational thought and rational being influence eachother.  Therefor, if someone is incapable of rational thought they must be an irrational being.  And this is no the case.

Rational being simply means someone existing/living that was created by a being who was rational...~Oxford English Dictionary  So, in Tolkien's case, Eru was "rational" and everything that comes from him is a rational being.

Rational thought is the ability to think with reason or logic. (OED)  Morgoth lost his rational thought, but that does not change his state of being, as Narg points out.  He was still a rational being because he was still from Eru. 

I'll take an example of Orcs.  A lot of people think Orcs are irreedemable, they are puppets and are just bred for spite and hate.  But even Tolkien points out that Orcs are not beyond redemption because they are part of the world, and being part of the world that is God's (or Eru's) good:

They would be Morgoth’s greatest Sins, abuses of his highest privilege, and would be creatures begotten of Sin, and naturally bad (I nearly wrote ’irredeemably bad’; but that would be going too far. Because by accepting or tolerating their making - necessary to their actual existence - even Orcs would become part of the World, which is God’s and ultimatly good.)~Letter #153

Orcs were bred by Morgoth and bred to be naturally bad.  It's like a parent that only teaches from the moment their child is born hatred, spite, and wickedness, and the child hears nothing else but this.  The child does not hear the other side, the kindess, and to be nice, but is bred and trained to be cruel and full of hate.  Who's to blame for the child knowing nothing else but hatred, because they learned nothing else?

First point--Then this discussion is going to go nowhere, as you are either too stubborn or too proud to see what is truly being said.

Second point--Lord Lorien is using Orcs as an example. They don't come into the discussion directly, but as an example they are fine.

mos, obviously Tolkien did not like the idea that some one was beyond redemption:
I nearly wrote ’irredeemably bad’; but that would be going too far.
So, in Tolkien's mind, something irredeemable is "going too far."

Also:
Then Iluvatar said to them: "Of the theme that I have declared to you, I will now that ye make in harmony together a Great Music.  And since I have kindled you with the Flame Imperishable, ye shall show forth your powers in adorning this theme,...~The Music of the Ainur

Narguzir - posts like that are contributing nothing.

Boromir - Melkor is kindled with the Flame imperishable yes, but he is not OF arda itself unlike the Children of Iluvatar. There bodies are made out of Arda, Melkor's is not, thus making him not Arda itself (not OF the world).

Oh and about your quote Narg - Melkor PUT himself into arda, that doesn't mean to say he was OF it.

LETS PUT ASIDE THE RATIONAL/IRRATIONAL PART FOR NOW.

WHAT OTHER QUOTES CAN YOU PROVIDE TO SHOW SAURON WAS EVILER THAN MELKOR?  There are too many flaws with the 'Rational' quote, three i can think of.

Can you give any other quotes?