It is because you are actually blind, as the word said of you (please do not think me harsh, I am simply relating the condition as Revelation 3 says)
Psa 119:172 My tongue shall speak of thy word: for all thy commandments are righteousness.
The Sabbath is holy time. Therefore, to transgress it for one's own purposes not in obedience to the commandment (Exodus 20:8-11) is self-righteousness (one's own standard of 'right'-doing) and is actually coveting and theft/stealing (misappropriation) of time (tithe of time, 1/10th of 10).
Thus it sets up an idol of self as the standard, and thus is spiritual adultery.
Isa_58:13 If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the LORD, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words:
So to continue to do one's own pleasure and not God's pleasure, is to "pleasure yourself". Isn't it?
Who doesn't inherit the kingdom?
Gal 5:19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
Gal 5:20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
Gal 5:21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
Thus to misappropriate the sacred time for one's own standards/uses, is to murder oneself, since they no longer "rest" as the living soul (Genesis 2:7; Mark 2:27) was made to do. It would be the same as continuing to work the body without sleep. Eventually it will break down and cease to properly function.
1Sa_15:23 For rebellion is as the sin of witchcraft, and stubbornness is as iniquity and idolatry. Because thou hast rejected the word of the LORD, he hath also rejected thee from being king.
1 John 3:4; Acts 14:15-16, 17:30.
Exodus 20:8-11; Matthew 5:17-19. To teach otherwise is heresy in the first degree.
More Apostolic teachings. We are heirs of the promise of faith through Abraham hundreds of years before the Sinai covenant:
Galatians 3: NASB
1You foolish Galatians, who has bewitched you, before whose eyes Jesus Christ was publicly portrayed
ascrucified?
2This is the only thing I want to find out from you: did you receive the Spirit by the works of the Law, or by hearing with faith?
3Are you so foolish? Having begun by the Spirit, are you now being perfected by the flesh?
4Did you suffer so many things in vain—if indeed it was in vain?
5So then, does He who provides you with the Spirit and works miracles among you, do it by the works of the Law, or by hearing with faith?
6Even so Abraham BELIEVED GOD, AND IT WAS RECKONED TO HIM AS RIGHTEOUSNESS.
7Therefore, be sure that it is those who are of faith who are sons of Abraham.
8The Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham,
saying,“ALL THE NATIONS WILL BE BLESSED IN YOU.”
9So then those who are of faith are blessed with Abraham, the believer.
10For as many as are of the works of the Law are under a curse; for it is written, “CURSED IS EVERYONE WHO DOES NOT ABIDE BY ALL THINGS WRITTEN IN THE BOOK OF THE LAW, TO PERFORM THEM.”
11Now that no one is justified by the Law before God is evident; for, “THE RIGHTEOUS MAN SHALL LIVE BY FAITH.”
12However, the Law is not of faith; on the contrary, “HE WHO PRACTICES THEM SHALL LIVE BY THEM.”
13Christ redeemed us from the curse of the Law, having become a curse for us—for it is written, “CURSED IS EVERYONE WHO HANGS ON ATREE”—
14in order that in Christ Jesus the blessing of Abraham might come to the Gentiles, so that we would receive the promise of the Spirit through faith.
Intent of the Law
15Brethren, I speak in terms of human relations: even though it is
only a man’s covenant, yet when it has been ratified, no one sets it aside or adds conditions to it.
16Now the promises were spoken to Abraham and to his seed. He does not say, “And to seeds,” as
referring to many, but
rather to one, “And to your seed,” that is, Christ.
17What I am saying is this: the Law, which came four hundred and thirty years later, does not invalidate a covenant previously ratified by God, so as to nullify the promise.
18For if the inheritance is based on law, it is no longer based on a promise; but God has granted it to Abraham by means of a promise.
19Why the Law then? It was added because of transgressions, having been ordained through angels by the agency of a mediator, until the seed would come to whom the promise had been made.
20Now a mediator is not for one
party only; whereas God is
only one.
21Is the Law then contrary to the promises of God? May it never be! For if a law had been given which was able to impart life, then righteousness would indeed have been based on law.
22But the Scripture has shut up everyone under sin, so that the promise by faith in Jesus Christ might be given to those who believe.
23But before faith came, we were kept in custody under the law, being shut up to the faith which was later to be revealed.
24Therefore the Law has become our tutor
to lead us to Christ, so that we may be justified by faith.
25But now that faith has come, we are no longer under a tutor.
26For you are all sons of God through faith in Christ Jesus.
27For all of you who were baptized into Christ have clothed yourselves with Christ.
28There is neither Jew nor Greek, there is neither slave nor free man, there is neither male nor female; for you are all one in Christ Jesus.
29And if you belong to Christ, then you are Abraham’s descendants, heirs according to promise. (NASB)
