Hebrews 4:6-10

Therefore, since it remains for some to enter it, and those who formerly had good news preached to them failed to enter because of disobedience, He again fixes a certain day, “Today,” saying through David after so long a time just as has been said before, “TODAY IF YOU HEAR HIS VOICE, DO NOT HARDEN YOUR HEARTS.” For if Joshua had given them rest, He would not have spoken of another day after that. So there remains a Sabbath rest for the people of God. For the one who has entered His rest has himself also rested from his works, as God did from His.

vs 5-9 - "The divine promise still holds good; the believer may enter into God's rest through faith.  This is true of both salvation and sanctification.  Rest in the Christian life comes through complete reliance on God's promises and full surrender to His will (2 Cor 5:7; Col 2:6).  The word in verse 9 (rest) indicates that, just as God ceased from His creative activity on the seventh day (v 4), so believers may cease from working for their salvation and self-reliance in sanctification.  Or this sabbath-rest in sanctification may look forward to believers' future rest in heaven." (Ryrie)

v 7 - a certain day - "the day of the Pentecostal era.  After the close of that day individual Hebrews of course had the Gospel preached to them, but as sinners and not as Hebrews; for in the present Gospel of the heavenly election there is neither Jew nor Greek — only saved sinners." (Williams)

v 8 - "Joshua (Moses' successor) could not lead all the people into the rest of dwelling in their promised land because of their unbelief.  Likewise the believer today cannot enjoy a fully satisfying Christian life unless he believes all the promises of God, and even then he looks forward to that perfect future rest." (Ryrie)

v 9 - "The writer used here a different Greek work for "rest."  In his previous references to the idea of rest, he has used katapausis, meaning "a cessation from activity," thus "a rest," a general word for the idea of rest.  Now, he uses sabbatismos, the word used of the Sabbath rest.  The word points back to God's original rest, and speaks of the ideal rest.  It is a Sabbath rest because the believer reaches a definite stage of attainment and has satisfactorily accomplished a purpose, as God did when He finished the work of creation.  It is not the believer's rest into which he enters and in which he participates, but in God's unique, personal rest in which the believer shares." (Wuest)

v 10 - "The popular view that this verse treats of the sinner ceasing from his dead works and finding rest in Christ, is destroyed by the argument of the whole passage, and also by remembering that the works that God ceased from were good works, whilst the works of self-righteousness that the sinner ceases from are "evil works," (1 John 3:12) and therefore they cannot be compared." (Williams)