For day and night Thy hand was heavy upon me… -Psalm 32:4

You tell me you are sore troubled by reason of conviction, and that your convictions of sin are attended by the most terrible and gloomy thoughts, I am not at a loss to tell you why it is.

Do you wonder, then, that when He smites, His blows fell you to the ground? Are you astonished that when He wounds, His wounds are deep and hard to heal? Besides, remember it is an angry God that you have to deal with; One who has had patience with you in your sins these thirty, forty, or fifty years, and now He has come forth Himself to compel you to throw down the weapons of your rebellion, and to take you captive by His justice, that He may afterwards set you free by His grace. Is it any marvel, then, that when an angry God-a God who has restrained His anger these many years-comes out in battle against you, you find it hard to resist Him, and that His blows bruise you and break your bones, and make your spirit feel as if it must verily die…Be not astonished at all your terrors; God on Sinai, when He came to give the law, was terrible; but God on Sinai, when He comes to bring the law into the conscience, and to strike it home, must be more terrible far.

Oh! ye need not wonder that your pains are fearful, when God thus smites you on the tenderest part of a conscience which He has made tender by His grace. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0313.cfm