Do spirits/souls make decisions/think? Today I heard an instructor (a monk) saying:

At The Third Council of Constantinople, counted as the Sixth Ecumenical Council by the Orthodox Church, the Catholic Church and other Christian groups, met in 680/681 and condemned monoenergism and monothelitism as heretical and defined Jesus Christ as having two energies and two wills (divine and human).

And he explained that Jesus had two wills, as a human, he was able to do the wrong or the right thing, he chose the right path, to show us that we could be just like him and follow the road to salvation. He also had the will of a God, because he is God.

He added, we all have two wills, take saints as an example, they have the will of a human, they can make decisions, to do the wrong or the right thing, but when they become saints, they have the will of a saint, which is to be with God and so on.

So I asked him: well the devil was a spirit right? So he made the wrong decision and became a devil, in fact all devils were angels. Which poses two questions.


If Spirits/souls/angels (call them what you want) do think and make decisions, wouldn't be possible to someone in heaven, maybe a saint, to make a wrong decision and end up in hell, just like the devil?
If they don't think and don't make decisions, meaning that if you were a saint on earth, you'll be a saint forever. Then how did the devil make the wrong decision? Furthermore, how do spirits live in heaven or hell, as objects?


He said we'll discuss that later, let me finish the course, so I'm bringing this topic to here.
When thinking about angels the scripture does not provide details of how they followed the Devil's pride in rebellion to God. However the two things it does it impress upon us is that they fell together. In other words God allowed something to test them and this split the good angels from the evil ones accordingly.  As God is omnipotent he is perfectly able to test the will of a creature and then prevent all future tests and temptations ensuring they are forever protected by the measure of godliness that he has filled them with, securing the boundary of their own volition within his boundless glory. This does not mean they are now robots it just means they are protected. It means they only make free choices that are not harmful to themselves, a heavenly freedom from earthly bondage including the tyranny of the Devil, sin and death.

As we turn to humans its all different.   Each human is born from another human, so individual testing could not occur all at once to winnow out the good and the bad. Furthermore due to the fall of mankind in Adam in some sense everyone failed the test in Adam. This means the choice was no longer possible accept under a redemption plan whereby our choice is enabled.  

Once in heaven the same reality applies to saints as it does to angels. God is able to protect us from the type of test that fell upon the angels and he can do this forever and ever. This is clearly implied by the fact that saints inherit 'eternal life', not merely the 'potential' of it.