“Yea, I have loved thee with an everlasting love: therefore with lovingkindness have I drawn thee.” – Jeremiah 31:3

As you sit down and consider for yourself, “God has loved me, for He has given me salvation in Jesus Christ, and the mountains may depart, and the hills be removed, but the covenant of His grace cannot depart from me;” will not your cup run over, and your soul dance before the ark of God? Of course, it will not be so till you have found the word for yourself, and have eaten it, but then it shall be marrow and fatness to you. Thousands of God’s people live in doubts and fears, because they have not eaten of God’s word as they should; they do not know the fullness of the blessings of the gospel of peace. How many are in bondage through the fear that though they have been for years believers they are not yet saved, whereas if they read the Scriptures, and received their meaning, they would know that the moment the sinner believes in Christ he is saved and in that very instant he has passed from death into life and shall never come into condemnation. If they read the Scriptures, would they endure such doubts about being left to perish after having believed? The thing is impossible. The people of His choice Jehovah cannot cast away. No members of Christ’s body shall be suffered to perish, or else the body of Christ would be mangled, and He Himself would be the head of a dismembered frame. To have a clear understanding of the gospel, to know the covenant which, like a mighty rock, underlies all gospel blessings, to know Christ and our union with Him, to know His righteousness, His perfection and our perfection in Him, to know the indwelling of the Holy Ghost, these things must inevitably make us strong in the joy of the Lord. Half our doubts and fears would vanish if we had more acquaintance with the Lord’s statutes. Other knowledge brings sorrow, but this wisdom is the joy and rejoicing of the heart. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0980.cfm