LOL Jonathan Edwards was probably one of the greatest evangelists of the last century. His writings are pretty amazing and very indepth but the english is last century English so pretty heavy going.

I am doing him a huge injustice to summarise what he said in one sentence like that.

Essentially what he says (and I haven't read it all) is that Jesus made the ultimate sacrifice (dying) because He loved us. To reject that sacrifice by continuing in sin demonstrates our ingratitude and unappreciation for that sacrifice.

Basically if you love someone you don't say to them "Hey you know that thing you did for me - dying and all - well it means so little to me that I am just going to carry on doing the thing you had to die for"

Does that make more sense?

Paul says regarding grace and continuing to sin -

ROMANS CHAPTER 6

What shall we say, then? Should we continue to live in sin so that God's grace will increase?
Certainly not! We have died to sin---how then can we go on living in it?
For surely you know that when we were baptized into union with Christ Jesus, we were baptized into union with his death.
By our baptism, then, we were buried with him and shared his death, in order that, just as Christ was raised from death by the glorious power of the Father, so also we might live a new life.
For since we have become one with him in dying as he did, in the same way we shall be one with him by being raised to life as he was.
And we know that our old being has been put to death with Christ on his cross, in order that the power of the sinful self might be destroyed, so that we should no longer be the slaves of sin.
For when we die, we are set free from the power of sin.
Since we have died with Christ, we believe that we will also live with him.
For we know that Christ has been raised from death and will never die again---death will no longer rule over him.
And so, because he died, sin has no power over him; and now he lives his life in fellowship with God.
In the same way you are to think of yourselves as dead, so far as sin is concerned, but living in fellowship with God through Christ Jesus.

Sin must no longer rule in your mortal bodies, so that you obey the desires of your natural self.

Nor must you surrender any part of yourselves to sin to be used for wicked purposes. Instead, give yourselves to God, as those who have been brought from death to life, and surrender your whole being to him to be used for righteous purposes.
Sin must not be your master; for you do not live under law but under God's grace.
What, then? Shall we sin, because we are not under law but under God's grace? By no means!
Surely you know that when you surrender yourselves as slaves to obey someone, you are in fact the slaves of the master you obey---either of sin, which results in death, or of obedience, which results in being put right with God.
But thanks be to God! For though at one time you were slaves to sin, you have obeyed with all your heart the truths found in the teaching you received.
You were set free from sin and became the slaves of righteousness.
I use everyday language because of the weakness of your natural selves.) At one time you surrendered yourselves entirely as slaves to impurity and wickedness for wicked purposes. In the same way you must now surrender yourselves entirely as slaves of righteousness for holy purposes.
When you were the slaves of sin, you were free from righteousness.
What did you gain from doing the things that you are now ashamed of ? The result of those things is death!
But now you have been set free from sin and are the slaves of God. Your gain is a life fully dedicated to him, and the result is eternal life.
For sin pays its wage---death; but God's free gift is eternal life in union with Christ Jesus our Lord.


Basically Paul first addresses the question that should we continue to sin so that there can be more grace - the answer is NO!

Then he says - how can you continue to sin because don't you know that the old self is dead to sin because when you were baptised you were baptised into the death of Christ. That part of you that was sinful is DEAD!

Then he says expressely that we must not sin simply because we are under grace.

We have been set free from bondage to sin by the cross we are no longer COMPELLED to sin therefore we are without any reason to continue in sin.

Hebrews 10:26-29

For there is no longer any sacrifice that will take away sins if we purposely go on sinning after the truth has been made known to us.
Instead, all that is left is to wait in fear for the coming Judgment and the fierce fire which will destroy those who oppose God!
Anyone who disobeys the Law of Moses is put to death without any mercy when judged guilty from the evidence of two or more witnesses.
What, then, of those who despise the Son of God? who treat as a cheap thing the blood of God's covenant which purified them from sin? who insult the Spirit of grace? Just think how much worse is the punishment they will deserve!

Scary scripture - basically what Paul is saying is that if you continue to sin there is nothing that save you because you are treating the sacrifice Jesus made with disrespect 'as a cheap thing'