The greatest labor of laboring to enter into His rest is in not laboring at all.
Hebrews 4:10-11 KJVS
For he that is entered into his rest, he also hath ceased from his own works, as God did from his.
[11] Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.
Entering into the rest of God is like walking into a room. Once we do, we do not have to try to be in that room, strive to stay in that room, work to be there. We accept our place in His rest. God's rest home as it were.
I had an aunt Mary who was a Christian and who radiated peace. Even as an unsaved child I saw something unique in her. Never fretful or critical, taking the harshest things in Stride. ALWAYS gracious and soft spoken.
I now realize she had entered into the rest of the Lord and was no longer laboring to be there.
The rest, peace of God is a place to abide. The greatest frustration is allowing anything to remove us from the place of resting in Him continually. I confess to you that from time to time I allow something to evict me from His peace. My only solace is that it takes less time to re enter His rest than in past times.
What removes me? Anger, fear, self condemnation, weariness, lack of faith, chronic pain, rejection. All the things of the world that fight us and try to hinder us. We stumble on our corpses.
Nahum 3:3 KJVS
The horseman lifteth up both the bright sword and the glittering spear: and there is a multitude of slain, and a great number of carcases; and there is none end of their corpses; they stumble upon their corpses:
Not allowing anything to remove us from that rest of God is the greatest struggle, labor.
Hebrews 4:9 KJVS
There remaineth therefore a rest to the people of God.
Religion says work work work to be accepted by God. That rest only comes in "the sweet by and by". As my old pastor was fond of saying "Honey we don't need it in the sweet by and by, but in the dirty here and now"!
As spirit baptized Christian believers we can always walk in His rest and the labors given us are light burdens that seem not to be work at all. His yoke is easy and will not hinder the peace and rest.