Then said I, Lo, I come. – Psalm 40:7

The Lord Jesus is to come a second time; and when will He come? He will come when man’s hope is a failure. He will come when iniquity abounds, and the love of many hath waxed cold. He will come when dreams of a golden age shall be turned into the dread reality of abounding evil. Do not dream that the world will go on improving and improving, and that the improvement will naturally culminate in the millennium. No such thing. It may grow better for a while, better under certain aspects; but, afterwards the power of the better element will ebb out like the sea, even though each wave should look like an advance. That day shall not come except there be a falling away first. Even the wise virgins will sleep, and the men of the world will be, as in the days of Noah, eating and drinking, marrying and being given in marriage. On a sudden, the Lord will come as a thief in the night. The deluge of fire will find men as unprepared as did the deluge of water. He will come taking vengeance on His adversaries. When things wax worse and worse we see the tokens of His speedy coming. He will shortly appear, for the sky is darkening. When every hope will seem blotted out, and nothing but grim ages of anarchy and ungodliness are to be expected, then our Deliverer will come. When the tale of bricks was doubled in Egypt, Moses came; and when the world attains to its utmost unbelief and iniquity, Jesus will come. So at this moment my hearer may be saying, “I cannot be worse than I am; if I am not actually in hell already, yet I feel a fire within which tortures my soul. The sword of vengeance hangs over my head suspended by a single hair. I tremble to live, and I fear to die. Lost! Lost! Lost! I am past hope! “This is the time for my text: “Then said I, Lo, I come.” He who is able to save to the uttermost appears to the soul when every other hope disappears. In your deep distress I see a token for good. You are now reduced to spiritual death, and now I trust the eternal life will visit you. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2203.cfm