And they that went in, went in male and female of all flesh, as God had commanded him: and the LORD shut him in. -Genesis 7:16

See Noah and his family entering the ark! I do not think I should have selected the ark as a place of residence myself, nor would you have chosen to live in a place pitched within and without with pitch, with only one door and one window to it, and a great menagerie of birds, and beasts, and reptiles inside it. Whether that window ran all round the top just under the roof, so as to let light into the whole structure, I cannot tell; but I have no doubt that the jeering world said to Noah, “Well, old man, you have built a prison for yourself, and the sooner you go inside and shut yourself in the better; for we have had enough of your preaching!” When the good man and his family went in, and the Lord shut the door, they were dead to the world…When the Lord shuts you off from the world, you are best alone. Nowadays professors have not faith enough to dwell alone. They want two or three doors in the back of the ark, so that they may slip out every now and then, and do a little pleasuring with the world, and then glide back again and look like saints. As to being shut in with God and separated from the world-religious and irreligious-how few will endure it! How little is ever heard of that cry-“Come out from among them, and be ye separate!” “You might as well be dead,” cries one, “as be out of society.” Exactly so: and that is what the child of God looks for. “Ye are dead, and your life is hid with Christ in God.” “Buried with Him by baptism into death.” “God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world.” That separatedness which Noah took upon himself so willingly was involved in his salvation; for if he had lived with the world, he would have died with the world. Only in separation is salvation. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2147.cfm