I believe that the rest spoken in this text is a be still and know that I am God reference. Many are the affliction of the righteous but the Lord delivers,after the deliverance comes rest peace, this is a theme in the word. We are gentiles united by faith this makes us the people of God and entitled this rest after endurance as a good solider

As all GODS word has to be revealed through his spirit to ours for revelation, this one is no different. With the revelation that the six days of creation were actually ages than the seventh is an age also that we are still in. So let us enter into that rest by believing the works that CHRIST did on the cross for us and leave our labour of sinful works and do the labour of righteous works to the saving of our souls on that last day.

Paul speaking to the jews was saying that the jews,not being indwelt by the Holy Spirit thru Jesus, must strive to keep the law of Moses. This they cannot do. Born again Christians having within them the Holy Spirit and Jesus the Christ do the will of God as He leads and inspires them. That is to say they have found rest in God.

since we are righteous because we have received by faith the righteousness of God we can rest in his perfectness as if it was our own. Indeed by face it is our own. So we are righteous because he was righteous and then parted to us through face a bright justness. As such having already received I write sins like rice there is no need to seek why works another kind of righteousness. Not that Christians are supposed to do good works what are works do not count toward our salvation nor toward our own righteousness. From Isaiah our righteousness is like filthy rags in God 's eyes. We can now in this world have a rest from our labors as he promised and it 's available to us through face. I believe that I have obtained God 's rest here and now. Not by my own actions but because of His righteous actions imputed to me by face. His Spirit living in me produces it love that must be directed to his creation. As such I am compelled to love my neighbor as myself. These actions do not make me write this. Or perfect. I am already righteous. I am already perfect. By faith in Christ. My actions are an outflow of his and all his love. As such I am at rest. I have entered into his rest by faith here and now. It 's something that every Christian can attain unto by faith in Christ.