As Christians, we believe that the world was formed by God, that His words brought light into the earth (Gen 1:3) We believe God called out the land, waters and the heavens and spoke out the sun, moon, stars, trees and animals into existence (Gen 1:6-26). We believe what we see are made by things we cannot see (Heb.11:3) In other words, we believe in the unseen spiritual realm (Heb.1:11).
Now, God made a covenant with Abraham to be his God and heavenly Father (Gen.17:7). Like a father, God wants to bless Abraham and his generations forever and like a son, Abraham, and therefore his generations thereafter are to obey and honour God's ways. To break the covenant would be as sin against God (Isa.24:5).
After God rescued Abraham's descendants, the Israelites, out of Egypt, they continued doing whatever was right in their own eyes (Deut.12:8). They didn't know they were breaking the covenant or the consequences of it. Thus God gave His statutes for them to understand sin. When God declared His statutes, they became spiritual laws that would govern the invisible spiritual realm forever; like gravity that is unseen but exists.
The old covenant was fulfilled by obeying God's laws and was sealed by the outward circumcision of the flesh. Today, the new covenant is fulfilled by obeying the inward convictions (Jhn.16:8) of the circumcised heart (Heb.8:10) sealed by the Holy Spirit (Eph.1:13). When we accept God as our heavenly Father, we also come under the spiritual implications of this everlasting covenant. All the curses of disobedience and blessings of obedience that were decreed by God are still in force (Deut.28).
Though they were God's chosen people, the Israelites did not attain God's righteousness (Roman.10:2-4) because of their disobedience and unbelief (Heb.3). Only 2 out of 600,000 men made it to the Promised Land (Num.14:30). If they who were promised the blessings of God from the beginning were cut off, what more those of us who have only been grafted into the covenant? (Rom 11:21-26).
So listen and obey the convictions of the Holy Spirit that you may walk in the righteousness of God and come into the amazing plans and blessings He has for you.