What is frightening is when we say:

“All that the LORD has spoken we will do, and we will be obedient.” So Moses took the blood, sprinkled it on the people, and said, “This is THE BLOOD OF THE COVENANT that the LORD has made with you in accordance with all these words.” Exodus 24:7-8

We are quick to say "we will be obedient", but if we sin defiantly and reject the Law of Moses, we are guilty.

But the person who sins defiantly, whether a native or foreigner, blasphemes the LORD. That person shall be cut off from his people. He shall certainly be cut off, because he has despised the word of the LORD and broken His commandment; his guilt remains on him.” Numbers 15:30-31

Anyone who despises the Word is insulting the spirit of Grace.

Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. How much more severely do you think one deserves to be punished who has trampled on the Son of God, profaned THE BLOOD OF THE COVENANT that sanctified him, and insulted the Spirit of grace? Hebrews 10:28-29

These are terrifying words.