Sadly, you did not really engage my post but instead answered in an indirect way. Okay, let me make a few observations about what you posted.
You stated: "A man asked Jesus this very question, "...What good thing shall I do that I may have eternal life?", and Jesus replied, Why callest thou me good? there is none good but one, that is, God: but if thou wilt enter into life, keep the commandments. (Matthew 19:16-19)."
You used, the above, as a proof text about works Salvation. You missed the point and lesson of these verses. Here is the entire context:
Mat 19:16-21 And behold, one came to him and said, Teacher, what good thing shall I do, that I may have eternal life? And he said unto him, Why askest thou me concerning that which is good? One there is who is good: but if thou wouldest enter into life, keep the commandments. He saith unto him, Which? And Jesus said, Thou shalt not kill, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness, Honor thy father and thy mother; and, Thou shalt love thy neighbor as thyself. The young man saith unto him, All these things have I observed: what lack I yet? Jesus said unto him, If thou wouldest be perfect, go, sell that which thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, follow me. But when the young man heard the saying, he went away sorrowful; for he was one that had great possessions.
Now let's break it down.
1) And behold, one came to him and said, Teacher, what good thing shall I do, that I may have eternal life? And he said unto him, Why askest thou me concerning that which is good? One there is who is good: but if thou wouldest enter into life, keep the commandments.
This man was attempting to obtain eternal life through works. The Lord said, then keep the commandments. The requirement for keeping the commandments is perfection. Only Jesus Christ could keep the commandments perfectly because his nature was/is Impeccable.
2) He saith unto him, Which? And Jesus said, Thou shalt not kill, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness, Honor thy father and thy mother; and, Thou shalt love thy neighbor as thyself.
Here the young man displays his ignorance by asking: "Which one". God requires ALL of The Law to be kept perfectly, there is no single Law that will do. The Lord replies with five of the Ten Commandments. The man responds to this in an unbelievably foolish way.
3) All these things have I observed: what lack I yet?
This proves, that the young man had no concept of what these laws required. If he had ever thought of wishing someone dead or harm, he was guilty of violating the Law that says: Thou shalt not kill". If he had told a "little white lie" about someone, he was guilty of violating the Law that said: Thou shalt no bear false witness.".
4) Jesus said unto him, If thou wouldest be perfect, go, sell that which thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, follow me. But when the young man heard the saying, he went away sorrowful; for he was one that had great possessions.
According to the Greek language, when Christ said to him: "If thou wouldest be perfect..." This indicates a sarcastic retort. Christ knew what was in the heart of this man and knew he was not perfect, so He goes right to the heart of the matter and gives him a command He knows this young man cannot keep - ".. go, sell that which thou hast..." This command forces a choice, either choose God or choose your material wealth. It tested what this man truly loved and the young man failed. Just as we all would fail.
These passages are not about works for Salvation but rather, show clearly, the foolishness of thinking it can be obtained in this way.
John_14:6 Jesus saith unto him, I am the way, and the truth, and the life: no one cometh unto the Father, but by me.
As to Hebrews 10:26 - For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more a sacrifice for sins,
The intention here, is not a single sin, but the continuance in the principles of sin. This passage is referring to a complete falling away or one becoming an Apostate. The writer is saying the same thing, in a different way, that our Lord said here: Mat_12:31 Therefore I say unto you, Every sin and blasphemy shall be forgiven unto men; but the blasphemy against the Spirit shall not be forgiven.