The moral decisions required for ethical purity are difficult and entail suffering. They require constant attention, watchfulness, focus. Kedping watch and focused practice is difficult -- it often feels constricting, like going through a funnel. Eventually, we are enticed away from keeping watch to slacken and "be human," to be somnolent/relaxed, distracted, dissolute.
I call to mind the Lord's words about a "camel going through the eye of a needle" -- it is easier for a camel to go through the eye of a needle than for the rich man to enter into the kingdom of God. (I wrote before on this passage.)
We see this in St. Paul's argument throughout Colossians, where he sounds it off at the beginning:
For it pleased the Father that in Him all the fullness [of God] should dwell, and by Him to reconcile all things to Himself, by Him, whether things on earth or things in heaven, having made peace through the blood of His cross.
And you, who once were alienated and enemies in your mind by wicked works, yet now He has reconciled in the body of His flesh through death, to present you holy, and blameless, and above reproach in His sight— if indeed you continue in the faith, grounded and steadfast, and are not moved away from the hope of the gospel which you heard, which was preached to every creature under heaven, of which I, Paul, became a minister. [Colossians 1:19-23, NKJV, my edits]
[Christ] we preach, warning every man and teaching every man in all wisdom, that we may present every man perfect in Christ Jesus. [Colossians 1:28]
"If you continue in the faith, grounded and steadfast, and are not moved away from the hope of the Gospel." Immovability entails this funnel -- it is difficult to avoid passionate distractions from this end of our salvation and perfection ("perfect in Christ Jesus"), whether they are publicly recognized as such or not.
We are to
[hold ]fast to the Head, from whom all the body, nourished and knit together by joints and ligaments, grows with the increase that is from God. [Colossians 2:19]
Our steadfastness is not necesssary because God wishes to reward it extrinsically, as though our salvation were something external to our cleaving to God in Christ, "in whom all the fulness of the Godhead dwells bodily" (2:9), but is simply our abiding in Christ, our drinking from the fount of His divine-humanity via our loving attention, obedience, delight. This requires the stripping away of all sin, though:
In Him you were also circumcised with the circumcision made without hands, by putting off the body of the sins of the flesh, by the circumcision of Christ, buried with Him in baptism, in which you also were raised with Him through faith in the working of God, who raised Him from the dead (2:11-12)
If then you were raised with Christ, seek those things which are above, where Christ is, sitting at the right hand of God. Set your mind on things above, not on things on the earth. (3:1-2)
Therefore put to death your members which are on the earth: fornication, uncleanness, passion, evil desire, and covetousness, which is idolatry. (3:5)
But now you yourselves are to put off all these: anger, wrath, malice, blasphemy, filthy language out of your mouth. Do not lie to one another, since you have put off the old man with his deeds, and have put on the new man who is renewed in knowledge according to the image of Him who created him (3:8-10)
And then the goal of this stripping-away, which is the acquisition of holy things:
Therefore, as the elect of God, holy and beloved, put on tender mercies, kindness, humility, meekness, longsuffering; bearing with one another, and forgiving one another, if anyone has a complaint against another; even as Christ forgave you, so you also must do. But above all these things put on love, which is the bond of perfection. And let the peace of God rule in your hearts, to which also you were called in one body; and be thankful. Let the word of Christ dwell in you richly in all wisdom, teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord. And whatever you do in word or deed, do all in the name of the Lord Jesus, giving thanks to God the Father through Him. (3:12-17)
This is so much more than a Boy-Scout ethic. How far we are from this! --not merely from the virtues listed as though they were to be considered abstractly, and we against them as a background, but singing to each other always, being thankful, letting the peace of God rule in our hearts, teaching one another, giving thanks to God the Father through Christ in all things, doing all in the Name of Christ -- that is, out of a desire for Him and, so to speak, manifesting Him in all things. This really does require the stripping away of the "sins of the flesh" that we have put off in baptism, and the vesting with the New Man, Christ.
It requires that we go through a funnel of sorts, as the camel through the eye of a needle. This cannot be but a painful exercise for those of us who are burdened like the rich man.