And the gates of it shall not be shut at all by day - It shall be constantly open, allowing free ingress and egress to all who reside there. The language is derived from Isaiah 60:11. See the notes on that place. Applied to the future state of the blessed, it would seem to mean, that while this will be their permanent abode, yet that the dwellers there will not be prisoners. The universe will be open to them. They will be permitted to go forth and visit every world, and survey the works of God in all parts of his dominions.
For there shall be no night there - It shall be all day; all unclouded splendor. When, therefore, it is said that the gates should not be "shut by day," it means that they would never be shut. When it is said that there would be no night there, it is, undoubtedly, to be taken as meaning that there would be no literal darkness, and nothing of which night is the emblem: no calamity, no sorrow, no bereavement, no darkened windows on account of the loss of friends and kindred. Compare the notes on Revelation 21:4.

The gates of it shall not be shut at all - The Christian Church shall ever stand open to receive sinners of all sorts, degrees, and nations.
There shall be no night there - No more idolatry, no intellectual darkness; the Scriptures shall be everywhere read, the pure word everywhere preached, and the Spirit of God shall shine and work in every heart.

And the gates of it shall not be shut at all by day,.... Which does not design the free communication between the living saints on the new earth, and the raised ones in the new heaven, as some have thought, for these shall be together, and make up one body; but rather the universal collection, and free admission of all the saints from all parts into this city; though it seems best to interpret it of the safety of the inhabitants, see Jeremiah 49:31 who will have no enemy to fear, and therefore need never shut their gates; the beast and false prophet will have been taken, and cast into the lake of fire long ago; ungodly men will be destroyed in the general conflagration, and Satan will be bound in the bottomless pit during the thousand years:
for there shall be no night there; this is a reason given why it is before said the gates shall not be shut by day, since it is unusual to shut gates in the day, unless in time of war, because there will be no night in this city, and so no need of ever shutting the gates; the night time being the season for thieves and robbers, and for enemies to make their incursions, and to surprise: but here will be no night; either literally, times and seasons, as measured by the revolutions of the sun and moon, will be no more, they will not have the use they have; at least this city will stand in no need of them. The Jews say (c), that the world to come will be , "all day": or mystically and figuratively, there will be no night of spiritual darkness and desertion, of drowsiness, sleepiness, and inactivity, of error and heresy, or of calamity and distress of any kind; all which are sometimes signified by night in Scripture; see Song 3:1 Isaiah 26:9.
(c) Bereshit Rabba, sect. 91. fol. 79. 4.

not be shut . . . by day--therefore shall never be shut: for it shall always be day. Gates are usually shut by night: but in it shall be no night. There shall be continual free ingress into it, so as that all which is blessed and glorious may continually be brought into it. So in the millennial type.