And I will give you rest. – Matthew 11:28

Notice the promise spoken, “I will give you rest.” “I will give.” It is a rest that is a gift; not a rest found in our experience by degrees but given at once…We come to Jesus; we put out the empty hand of faith, and rest is given us at once most freely. We possess it at once, and it is ours forever. It is a present rest, rest now; not rest after death; not rest after a time of probation and growth and advancement; but it is rest given when we come to Jesus, given there and then. And it is perfect rest too; for it is not said, nor is it implied, that the rest is incomplete. We do not read, “I will give you partial rest,” but “rest,” as much as if there were no other form of it. It is perfect and complete in itself. In the blood and righteousness of Jesus our peace is perfect.

Jesus promises and Jesus performs. Did not all your rest, when first your sin was forgiven, come from Him? The load was gone, but who took it? The yoke was removed, but who lifted it from off the shoulder? Do you not give to Jesus, this day, the glory of all your rest from the burden of guilt? Do you not praise His name with all your soul? Yes, I know you do. And you know how that rest came to you. It was by His substitution and your faith in that substitution. Your sin was not pardoned by a violation of divine justice; justice was satisfied in Jesus; He gave you rest. The fact that He has made full atonement is the rest of your spirit. I know that deep down in your conscience, the calm which blesses you springs from a belief in your Lord’s vicarious sacrifice. He bore the unrest that you might have the rest, and you receive rest this day as a free gift from Him. You have done now with servile toils and hopeless burdens, you have entered into rest through believing; but all the rest and deliverance still comes to you as a gift from His dear hands, who purchased with a price this blessing for your souls. I earnestly wish that many who have never felt that rest, would come and have it; it is all they have to do to obtain it- to come for it; just where they now are, if God enables them to exercise a simple act of faith in Jesus, He will give them rest from all their past sins, from all their efforts to save themselves, a rest which shall be to His glory and to their joy. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0969.cfm