Good question Ella85, it falls right up there with what is our purpose here and in a way both go hand in hand as a function to each other.
1. To show God we choose him in all things we do over ourselves
2. To show God we choose him in all things before ourselves.
Galations 5:17
For the flesh desires what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are in conflict with each other,
so that you are not to do whatever you want.
We can think of this like boot camp,
and Earth is our proving grounds, our purging of impurities of the fall of man and our tempering through trials which toughens us for battle so we don't break when first put to use.
If we're gonna be more than just conquerors against a formidable enemy we have not met, spoken with nor seen we must be able to conquer our own flesh first which we have seen.
Otherwise how can one conquer the enemy unless they can first overcome their own fleshly desires.
Not saying it's easy, but just saying.
If it was easy it wouldn't be worth it. So yes it's worth it.
We were first made to be magnificent, our enemy knew our weaknesses in the beginning and he knows them now.
Our enemy has a weakness too though, overcome the flesh and walk in the spirit and he gains no further ground in ones life.
Once one overcomes the earthly body we are first given, ain't no body nor spirit can have control over us except that which we allow.
God likes to see that in it's entirety.
And then see we give him complete control over us surrendering to him as a vessel to the Holy spirit.
We then become a slave to righteousness and no longer a slave to the flesh.
Jesus spent 40 days in the desert...didn't eat or drink.
If any person could endure that resisting all temptation to feed the flesh, they could overcome anything.
Jesus did, and then went on to overcome everything.
3. After we show him that, we are not just transformed by the renewing of the mind but transformed in the twinkling of an eye into a new body with new type of flesh.
1 Cor 15
37When you sow, you do not plant the body that will be, but just a seed, perhaps of wheat or of something else. 38But God gives it a body as he has determined, and to each kind of seed he gives its own body. 39Not all flesh is the same: People have one kind of flesh, animals have another, birds another and fish another. 40There are also heavenly bodies and there are earthly bodies; but the splendor of the heavenly bodies is one kind, and the splendor of the earthly bodies is another. 41The sun has one kind of splendor, the moon another and the stars another; and star differs from star in splendor.
So I'd like to tie your question into why are we here?
This is our proving grounds...studying to show ourselves approved, and what we will blossom into once this body dies and is transformed into a new.
We have the power and authority to kick the devils butt by not giving into temptation that feeds the flesh.
Because the principal of temptation is still present in heaven to serve the self even in heaven.
But we cannot prove we will resist that in heaven like satan did and got kicked out, because we wouldnt want to be kicked out like he was.
No it is better we do not enter yet until we show God what we will be like in heaven,,,,while here.
I hope God's scriptures here help answer the questions you've asked.
Take care