The author encourages to "boast in our hope firm until the end" (Heb 3:6) since "we have become partakers of Christ" (:14). But there is the danger of "any one of you [with] an evil, unbelieving heart that falls away from the living God" (:12). "There remains a Sabbath rest for the people of God" (4:9) "therefore let us be diligent to enter that rest, so that no one will fall" (:11). "Was it not with those who sinned, whose bodies fell in the wilderness" (3:17)? "Let us fear if, while a promise remains of entering His rest, any one of you may seem to have come short of it" (4:1). There are those "who have been enlightened . . . and made partakers of the Holy Spirit" (6:4) "and then have fallen away" (:6).
"His works were finished from the foundation of the world" (4:3) "'and God rested on the seventh day from all His works'" (:4). "The one who has entered His rest has himself also rested from his works, as God did from His" (:10). However God's works were finished, but yours are still taking place, so you'd have to wait a little longer to enter your rest. Perhaps entering "His rest" (:10) supercedes yours which inherits the qualifications of the former. By resting God relies upon that which was created in the first six days. Therefore someone who "enters His rest" (4:10) is depending on God's covering for his own ongoing functioning. That would incorporate God's guidance and provision.
"Therefore be diligent to enter" (Heb 4:11) since "those who formerly had good news preached to them failed to enter because of disobedience" (:6). They provoked, tried and tested God for forty years and hardened and went astray in their hearts and did not know God (3:8-10). "They were not able to enter because of unbelief" (:19) because they were "hardened by the deceitfulness of sin" (:13). "The word they heard did not profit them, because it was not united by faith in those who heard" (4:2). Faith is required to believe. God asked, "'How long will they not believe in Me, despite all the signs which I have performed in their midst'" (Nu 14:11)?