I suspect what I'm about to say is not what you expect, but here it goes:
There are four different kinds of Sabbaths, each representing successive stages in our spiritual maturity. The first, the weekly Sabbath, is spiritually celebrated when, with God’s help (always) we cease from sinning in action. The seven week Sabbath, i.e. Pentecost, is celebrated when we also stop sinning inwardly by means of consent. Looking at a woman lustfully for example, even if not carried out physically it is still considered adultery (Matthew 5:28). The seven year Sabbath is properly celebrated when the mind no longer follows after the suggestions of evil thoughts and desires. Finally, the Jubilee, the fifty year Sabbath is celebrated when the mind has completely eradicated even from memory everything evil. Jubilee interpreted means ‘loosening of bonds of the living’ or ‘loosening of mourning of the living.’ When the mind is completely loosed from the bonds of sin it needs no longer mourn and can enter into the joy (and rest) of the Lord.
As to the how all of the above are accomplished, the stoning of the man that was collecting sticks on the Sabbath by the sons of Israel gives us the pattern. He is a symbol of the outward man, the will of the flesh that through the senses as if hands, collects the causes of sin, the sticks that flare up the passions (vices) in us and kindle the fire of hell that awaits us if we don’t repent. Sons of Israel are our good thoughts and actions that put to death the will of the flesh by means of God’s commandments (the stones). With these very stones we also built the tower of the virtues (Luke 14:28) and war against the Devil that attacks us with his 20 thousand (Luke 14:31). The number 20 symbolizes the world that is made of the 4 elements that attracts our 5 senses with the pleasures of the flesh (4 x 5 = 20). Twenty thousand or four cubits and a span i.e. five fingers (LXX 1 Samuel 17:4) is the stature or strength of this spiritual Goliath. By training our senses to observe and make good use of and not abuse God’s creation, we render them smooth (1 Samuel 17:40) and with the sling of abstinence we knock our enemy to the ground. Christ did it for us when He assumed our human nature (the five stones) from the streams of this life and using the Cross as a sling and the suffering of His flesh (sense of touch) as stone defeated the enemy with his own sword, the unjust death of His body. This enemy of ours, this strong man whom Christ plundered (Matthew 12:29) and bound in the abyss (bottomless pit) of His love, in the abyss (water) of our baptismal regeneration, chaining him with the links of His commandments, which He inscribed in the abyss of our hearts so that he can no longer operate there, is yet allowed to be loosed and bring his seven generals (Matthew 12:45) according to the number of the seven deadly sins, for the purpose of our spiritually testing. These seven deadly sins operate in us in a three-fold manner after the three-fold division of our nature: soul (desire), heart (capacity for anger or love) and mind (Matthew 22:37). These correspond to the dragon (evil desire, gluttony, fornication, greed...), beast (anger, hatred, murder…) and false prophet (ignorance, falsehood, pride and other passions of the mind). Whoever is defeated by these in the microcosm of his being becomes part of the outward manifestation of these creatures. And while there are many possible historic manifestations and as many partial interpretations of Revelation, it is evident that the one that takes place in the inward man is what we need to focus on. "For we do not wrestle against flesh and blood, but against the rulers, against the authorities, against the cosmic powers over this present darkness, against the spiritual forces of evil in the heavenly places.” (Ephesians 6:12)
Forgive me for going off on a tangent there, but as you can see everything is related. As long as some evil desire lingers in our soul or we nurture hatred in our heart towards our neighbor and/or pride in our mind, it is impossible to enter into the promised spiritual rest.