This lesson starts with Matthew 5:17. "Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfill."

The verbs are the action words in a sentence. Here the verbs are "think" and "come" and "destroy" and "fulfill", so there is plenty of action. It is amazing to see what some of these action words are in the original Greek of the Gospel.

The lessons have shown us that the original word for "law" is "nomos". In Greek there is also a verb based on nomos which is "nomitzo" but here rendered "nomisete" which is the 2 aorist tense of the verb. The translators have conveniently translated the word with the English word "think" while in Greek it has a much richer meaning because in English there is no such word as "make it a law - or a custom - in your proclamation" The aorist tense which is rare in any other languages than ancient Greek, denotes that it is not only an action in the past, but something that is still effective.

Jesus had not come to make new laws or customs, but to reveal the deeper meaning of the basic laws and rules.

It's characteristic of SDA that they, extremely sensitive about and defensive of LAW AND ORDER (indeed, they are zealous for it), see every mention of LAW as being ultimately about the fourth commandment of the Decalogue and how righteous they are.

Jesus was NOT talking about LAW and ORDER, but saying in effect, "Think not that I am come to CAST ASIDE THE OLD TESTAMENT AND START A NEW RELIGION: I am not come to destroy, but to fulfill." He came to be the King of the Jews, to inherit the Throne of his father, David; and to fulfill the promise of the Messiah to the world, to be the Savior of humanity.

He was going to build on the foundations set by all those who had gone before him, to sweep aside the dross of modern interpretation and make the old ways shine again. That's all. "Therefore whoever hears these sayings of Mine, and does them, I will liken him to a wise man who built his house on the rock: and the rain descended, the floods came, and the winds blew and beat on that house; and it did not fall, for it was founded on the rock." (Mat. 7:24-25)

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How very "SDA" of you to say that.

If one sin is cherished in the soul, or one wrong practice retained in the life, the whole being is contaminated. The man becomes an instrument of unrighteousness. – {DA 313.1}

It's characteristic of non-SDAs that they, acting defensive about the law (trying to protect or justify themselves for not observing it), see every positive mention of the law as being ultimately about anything but the decalogue.
The law (the decalogue) and the gospel constitute the center of the Old Testament (as well as of the New). So yes, the passage does refer to the decalogue.

Many look at God's commands as impeding their happiness, as if God is keeping away something that would be for their good. They do not trust God's love and wisdom. Therefore, it should come as no surprise that saving faith leads to obedience and that disobedience leads to death, even under grace.

Joshua
22:5 But take diligent heed to do the commandment and the law, which Moses the servant of the LORD charged you, to love the LORD your God, and to walk in all his ways, and to keep his commandments, and to cleave unto him, and to serve him with all your heart and with all your soul.

Psalm
119:97 O how love I thy law! it [is] my meditation all the day.
119:113 I hate [vain] thoughts: but thy law do I love.
119:163 I hate and abhor lying: [but] thy law do I love.
119:165 Great peace have they which love thy law: and nothing shall offend them.

Romans
13:8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
13:9 For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if [there be] any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
13:10 Love worketh no ill to his neighbour: therefore love [is] the fulfilling of the law.

James
2:8 If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well:

It's difficult too diss on the law when the Bible speaks so highly of it. Can't imagine which one of the ten commandments I'd rather live without.

Our next study is on Christ and the Sabbath:

http://www.ssnet.org/lessons/14b/less05.html

This text tells us that God completed His creative work on the seventh day. This makes the sanctity of the seventh day a part of creation and not an addition to the creation.