They shall hunger no more, neither thirst any more; neither shall the sun light on them, nor any heat. -Revelation 7:16

We no doubt can appreciate in some measure, though not to the degree which we should if we were in Palestine in the middle of summer, we can appreciate the words, “Neither shall the sun light on them, nor any heat.” This signifies that nothing external shall injure the blessed. Take it literally. There shall be nothing in the surroundings of heavenly saints that shall cause glorified spirits any inconvenience. I think we may take it mainly in relation to the entire man glorified; and so let us say that on earth the sun lights on us and many heats in the form of affliction. What heats of affliction some here have passed through! Why there are some here who are seldom free from physical pain. There are many of the best of God’s children that, if they get an hour without pain, are joyful indeed. There are others that have had a great fight of affliction Through poverty they have fought hard. They have been industrious, but somehow or other God has marked them out for the scant tables and the thread-worn garments. They are the children of poverty, and the furnace heat is very hot about them. With others it has been repeated deaths of those they have loved. Ah! how sad is the widow’s case! How deep the grief of the fatherless! How great the sorrow of bereaved parents! Sometimes the arrows of God fly one after the other; first one falls and then another until we think we shall hardly have one left. These are the heats of the furnace of affliction… “Neither shall the sun light on them, nor any heat.” No poverty, no sickness, no bereavement, no ingratitude-nothing of the kind. They for ever rest from affliction.

“Cast all your care on Him. for He careth for you.” But they have no cares in heaven. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3499.cfm