There remaineth therefore a rest to the people of God. – Hebrews 4:9
Here on earth the believer enters into rest by faith; the Christian enjoys rest even in the wilderness; the promise is fulfilled. “They shall dwell safely in the wilderness, and sleep in the woods.” God giveth to His beloved sleep; there is a peace that passeth all understanding, which we may enjoy even in this land of turmoil, strife, and alarms, a peace which the worldling knoweth not of, nor can he guess it.
“A holy calm within the heart,
The pledge of glorious rest.
Which for the church of God remains,
The end of cares, the end of pains.”
But beloved, drink as we may of the cup of peace, the good wine is kept until a future time. The peace we drink to-day is dashed with some drops of bitter. There are disturbing thoughts; the cares of this world will come, doubts will arise; live as we may in this world, we must have disquietudes; thorns in the flesh must come. But oh! the “rest that remaineth for the people of God.” What good wine shall that be! God hath a sun without a spot, a sky without a cloud, a day without a night, a sea without a wave, a world without a tear. Happy are they who, having passed through this world, have entered into rest, and ceased from their own works, as God did from His, bathing their weary souls in seas of heavenly rest. ~ C.H. Spurgeon
https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0226.cfm