And they that went in, went in male and female of all flesh, as God had commanded him: and the shut him in. (Genesis 7:16)
Noah was shut in away from all the world by the hand of divine love. The door of election comes between us and the world in which one exists. We are not of this world, even as [Jesus was] not of this world. Into the sin, the gaiety, the pursuits of the multitude we cannot enter; we can not play in the streets of vanity fair with the children of darkness, for our heavenly Father has shut us in.
Noah was shut in with his God. "Come thou and all thy house into the ark" (Genesis 7-1) was the Lord's invitation, by which He clearly showed that He himself intended to dwell in the ark with His servant and his family. Thus all the chosen dwell in God and God in them. Happy people to be enclosed in the same circle that contains God in the Trinity of His persons: Father, Son, and Holy Spirit. Let us never be inattentive to that gracious call.
Come, my people, enter into your chambers, and shut your doors about you, and hide yourself as it were for a little moment until the indignation is gone. Noah was so shut up in that no evil could reach him. Floods did but lift him heavenward, and winds did but waft (blow him gently) him on his way. Outside of the ark was all ruin, but inside all was rest and peace. Without Christ we perish, but in Christ Jesus there is perfect safety.
Noah was so shut in that he could not even desire to come out, and those who are in Christ Jesus are in Him forever. They will go no more out forever, for eternal faithfulness has shut them in, and infernal malice cannot drag them out. The Prince of the house of David "shutteth, and no man openeth" (Rev. 3:7) When once in the last days, as the master house, He will rise up and shut the door, it will be in vain for mere professors of faith to knock, and cry "Lord, Lord open unto us," for that same door that shuts in the wise virgins will shut out the foolish forever. Lord shut me in Your grace.
From Charles Spurgeon Book "Morning & Evening"