We must take care not to nullify grace through legalism Gal. 2:21
Legalism (Works Salvation) is concerned with keeping the law while ignoring the law-giver.
How does this make sense. A man is called to turn to God through His Son. His Son tells them that if they want to live forever, they must repent and "Sin no more", or in another place, "Keep God's Commandments". How is following the instruction of God and HIS Son, wrong or evil, or "keeping the law while ignoring the law-giver".
Keeping what law? The Laws Jesus said to keep?
It's Christ-less law-keeping. It is elevating commandments of men to the level of a doctrine from God.”
So then, maybe I am understanding you now. If a religious sect or business, comes in Christ's Name, but they promote their own judgments, not God's, they our high days, not God's, their own Sabbaths, not God's, their own traditions and their own image of God in the likeness of a golden calf, or handsome man, this would be "Christ-less/Godless" (They are ONE, Yes) law-keeping". Elevating popular religious traditions of man to doctrines of God.
This makes perfect sense, as this is exactly what the mainstream religions of Jesus' Time did.
Mark 7: 9 And he said unto them, Full well ye reject the commandment of God, that ye may keep your own tradition.
So then "Legalism", is not "Yielding oneself" a servant to Obey God, as Jesus and all the Faithful examples in the Scriptures did, but "Yielding oneself" a servant to obey the doctrines and traditions of one of the many manmade religious sects and businesses of this world God placed us in, whose traditions cause those who adopt them to "Transgress God's Commandments".
I think Jesus would agree with this understanding.
Jesus plus nothing equals everything. That may be the best “math” equation ever. This formula reminds us that Jesus, and His sacrificial death and perfect righteous life, are our hope and peace. He alone is our salvation. He alone holds the hope of eternal life for sinners like us. It is through faith in Him that we become recipients of God’s eternal promises.
I see, so then like HE said, it's the "Doers" of His Sayings, not the hearers only, who will endure to the end. And what does HE say?
John 17: 3 And this is life eternal, that they might know thee "the only true God", and Jesus Christ, whom thou hast sent.
And how can a man "know this God"?
Jesus told us this as well, in my understanding.
Matt. 6: 33 But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you.
Which makes perfect sense. We all have works, but those who "do Truth" come to the Light in order to know if they are wrought in God, or man.