Adam and Eve were each 777 in the garden of Eden. This was a stage of perfect equilibrium in every human sense of the way. But it could obviously be upset by evil influences from the outside.
The first human stage of set or fixed perfection must be 888, which is a little lower than that of the unfallen angels (according to both the O.T. and the N.T. the Christ became a little lower than the angels [of course as far as His humanity is concerned]); which must be 999.
As the greatest philosopher Solomon probably got further than the apostle Paul, at least in certain respects, but further than 666 he did not advance (for it is unlikely that he became equal with our first progenitor, let alone surpassed him; for how did he fall again then!?) Also his annual income was 666 talents of gold, as if with all his wisdom, pomp and circumstance (according to the Christ a simple lily is clothed with greater honor) the whole thing stood in the sign of the beast, negatively spoken of course. For he is also a type of the Christ in the Millennium, Who will be more than just visited by the real spiritual queen of Sheba with all (our) questions for Him (Hallelujah!).
But of course the apostle Paul was the greatest theologian, who had heard unspeakable things in Paradise (which is in the third heaven [the atmosphere with the powers of the air being the first heaven and the universe of the stars being the second heaven]) and who could say of the gospel that it was his (naturally given to him by the Christ). All I want to say is that in true philosophy--the love of wisdom--Solomon surpassed him. Of course as the true theologian Paul stated that Christ became the wisdom of God and so theology surpasses philosophy. But despite all his wisdom Solomon came to offer his semen to the Moloch and ended a disgruntled king that taxed his people financially way too heavily for his personal aggrandizement. Hopefully he wrote the book of Ecclesiastes at the end of his life.
A warning must be sounded here. Most of what is called philosophy and theology, according to the apostle Paul, is rightly called empty deceit. Let us never forget that the 'fear of the Lord is the beginning of wisdom and of knowledge'!
In theory not only Adam and Eve, but also the unelected angels, could have gone on to holiness (just like the elected angels must be doing). There is no blame to be assigned to the Creator here, nor is it so that Adam or Satan had a hidden defect before their respective Falls.
Christ stated that a disciple is not to become more than his teacher (v. Lu. 6.40). Truly born-again Christians therefore will reach the set stage of 888, a position of human infallibility (of course as far as the human side is concerned. The beloved apostle John wrote also that we will be similar to Him, when He has been manifested to us [in all likelihood when He will spiritually marry the Church just before the Millennium and naturally in heaven]). This will not happen at the rapture and resurrection, as Christians will then invariably have to learn a lot yet.
Of course this does not mean that they can get lost again. This is not even the case before the resurrection. The Scripture verse of the Lord that we will receive in this time a hundredfold, houses, brothers, sisters, mothers, children, lands with persecutions (as a result of our deeds before, in the body before the Rapture and resurrection); is applicable here. In this time they will find themselves in a state between 777 and 888.
Being immortal and set free from the flesh they will also have 'to carry away both the good and the evil done in the body' to work out up to and including this set stage of 888. And this AFTER the Bema (Judgment) Seat of Christ (sic!), (see 2 Cor. 5. 10 on that).