The article below on the Free Will Defense to the Problem of Evil has generated some interesting comments. Here is one that caught my attention:
Perhaps in heaven God's immediate presence naturally produces the desire to remain as such, which consistently trumps any potential desire to sin.
I don't think it is God's presence so much as it is the fact that we have been changed from the inside out.
Chapter 9 of the Westminster Confession of Faith states the following:
Of Free Will
I. God has endued the will of man with that natural liberty, that is neither forced, nor, by any absolute necessity of nature, determined good, or evil.
II. Man, in his state of innocency, had freedom, and power to will and to do that which was good and well pleasing to God; but yet, mutably, so that he might fall from it.
III. Man, by his fall into a state of sin, has wholly lost all ability of will to any spiritual good accompanying salvation: so as, a natural man, being altogether averse from that good, and dead in sin, is not able, by his own strength, to convert himself, or to prepare himself thereunto.
IV. When God converts a sinner, and translates him into the state of grace, He frees him from his natural bondage under sin; and, by His grace alone, enables him freely to will and to do that which is spiritually good; yet so, as that by reason of his remaining corruption, he does not perfectly, or only, will that which is good, but does also will that which is evil.
V. The will of man is made perfectly and immutably free to do good alone in the state of glory only.
Supporting scripture ...
 EPH 4:13 Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ. HEB 12:23 To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect. 1JO 3:2 Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is. JUD 24 Now unto him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy.