The "day" He is most specifically talking about is likely our day right now, because "in that day" is a common biblical phrase to indicate the end time.
John W. Ritenbaugh
The Wisdom of Men and Faith
Most assuredly, neither Jesus' teaching nor His manner of living conformed to this world. His warning is that many will use His name and authority to do marvelous works, but in their personal lives they will not submit to the very instructions that would develop their relationship with God and work to produce His image in them! The only conclusion we can draw is that, despite receiving the instruction, they nonetheless conformed to the world.
Clearly, if we do not know God because we are not really walking in His shoes, as it were, if He does not recognize us or see in us any family resemblance to Him because we are not at one with Him, He will command us to depart, to leave the Marriage Supper! We will not spend eternity with Him. We will have built our house on sandy ground despite all the privileges and warnings given to us!
John W. Ritenbaugh
The Elements of Motivation (Part Two): Vision
Of all people, we who have left the Worldwide Church of God (WCG) in the past decade should be most aware of the antinomian spirit working in the church of God. The doctrinal changes that began to be instituted mere months after the death of Herbert W. Armstrong had as their goal the removal of God's law, particularly the Sabbath, from the church's beliefs. WCG's subsequent heavy emphasis on "grace" and "love," along with its renunciation of "legalism" exposed its antinomian position. Because of these changes, it has joined evangelical Protestant "Christianity" to the point that it now worships on Sunday, encourages celebration of Christmas and Easter, and permits the use of crucifixes and images of "Jesus" by its ministry and membership and in its publications.
The "Christian" churches of this world are predominantly antinomian to some extent. Both Roman Catholicism and Protestantism belong to what can be termed Hellenistic Christianity, that is, a form of Christianity heavily influenced by Greek philosophies, particularly Gnosticism. Catholicism is the more moderate of the two, having retained obedience to the Church and its traditions as well as requiring certain works for salvation. However, its belief of the afterlife, with its levels of heaven, limbo, purgatory, and beatific vision - not to mention its belief in an immortal soul - brand it as Gnostic.
Protestantism is more antinomian, having rejected Catholicism's works during the Reformation. Martin Luther's doctrine of salvation by grace "through faith alone" removes God's law from the equation altogether. Pure Protestant theology is so antinomian that it claims that lawkeeping in any form - which it terms "legalism" - is detrimental to the soul's growth in spirituality. This form of Christianity also champions the doctrine of eternal security, the idea that, once one accepts Jesus, he can never lose his salvation, no matter what sins he commits ("once saved, always saved"). This doctrine knocks out law and judgment for sin in one blow.
Of course, the world itself is antinomian because it is under the sway of Satan the Devil, who despises God's law (Ephesians 2:2; I John 5:19; Romans 8:7). He even tried his antinomian tricks on Jesus, who countered with quotations from the law (Matthew 4:1-10)! Certainly, our adversary will tempt us similarly, trying to get us to put God's law aside so we can fulfill our desires.
Jesus, however, in his prayer in John 17, asks God to help us in this, and He also gives us the antidote to antinomianism:
I do not pray that You should take them out of the world, but that You should keep [guard, protect] them from the evil one. They are not of the world, just as I am not of the world. Sanctify them by Your truth. Your word is truth. (verses 15-17)
Knowing God's truth and practicing it to become holy will protect us from the rampant antinomianism of this world, this age that is soon to end. Still to come are the Beast and his False Prophet, who will exemplify this anti-God, anti-Christ, anti-law spirit. To endure to the end, to survive the mystery of lawlessness that will mark the end time, we must hold fast to God's Word and seek His righteousness. "Blessed are those who do His commandments, that they may have the right to the tree of life, and may enter through the gates into the [New Jerusalem]" (Revelation 22:14).
Richard T. Ritenbaugh
These people profess Christ's name. They take it for themselves and do these so-called works, in which they seem to preach, prophesy, do good works like casting out demons, and perform wonders. Yet, what does Jesus say? "I never knew you."
What did they profess? They professed to know God and have a relationship with Him, but He says, "I never knew you, because really you never knew Me." How does He know that? They were practicing lawlessness!
What is lawlessness? Sin! These people lack obedience. They may have the knowledge, but they lack putting this knowledge into godly practice. They believe that they know God's will, but they do not do it. Failing to practice God's will, Jesus says, is sin. Why is failing to practice God's law sin? Because, if we are not doing God's will, we are certainly doing something else!
What is not of God is sin (compare Romans 14:23)!
They have not hit the mark, which is one of the definitions of sin. Obviously, their problems originate in the way they think. If their thoughts were godly, they would behave in a godly manner. However, since they do not behave in a godly manner, their thoughts must not really be godly.
Richard T. Ritenbaugh
Is God in All Our Thoughts?
In each case, Christ's admonition is that we should have a healthy skepticism of miracles because miracles may produce deception. It is not that the miracle does not occur. The more important point is, does it witness to the truth? Does it witness to the ultimate reality, the will of God?
In both Jesus' instruction in the New Testament (Matthew 24:24; 7:22-23; Revelation 13:13-14) and in Moses' teaching in the Old Testament (Deuteronomy 13:1-5), it is clear—regardless of the wonder done—if a person even implies that we are free to disobey God, the miracle is not a demonstration of God's truth. A miracle it was, but it does not validate God's truth.
We must be especially skeptical of those who say that they believe in keeping God's laws, and then turn right around and say that the Sabbath and holy days are no longer necessary and that "true Christians" can keep Christmas, Easter, Halloween, etc. But they "believe" that they are to keep God's laws! It is especially deceptive because so many of such people are really nice individuals.
John W. Ritenbaugh
Is God a Magician?
Many will seek to enter the Kingdom of God but be barred from it because of flagrant sin. Jesus will refuse to answer the knock of unruly sinners who have rejected salvation, though they weep and grind their teeth when they find out they cannot enter God's Kingdom. When the third resurrection arrives, all humanity will have had the opportunity to be saved; everyone's ultimate destiny will have been eternally set. It will be too late for anyone who, after coming to the knowledge of the truth, sins willfully and thereby rejects eternal life. Those who reject God and His way of life must then reap the consequences of that decision - the second death following the third resurrection to judgment.
Martin G. Collins
Basic Doctrines: The Third Resurrection
Other Forerunner Commentary entries containing Matthew 7:22: