“And I will shake all nations, and the desire of all nations shall come: and I will fill this house with glory, saith the Lord of Hosts.”- Haggai 2:7

The second temple was never intended to be as magnificent as the first. The first was to be the embodiment of the full glory of the dispensation of symbols and types, and was soon to pass away. This comparative feebleness had been proved by the idolatry and apostasy of the people Israel, and when they returned to Jerusalem they were to have a structure that would be sufficient for the purposes of their worship, but they were not again to be indulged with the splendours of the former house which God had erected by the hand of Solomon…The reason seems to me to be this: in the second temple, during the time it should stand, the dispensation of Christ was softly melted into the light of spiritual truth. The outward worship was to cease there. It seems right that it should cease in a temple that had not the external glory of the first. God intended there to light up the first beams of the spiritual splendour of the second temple, namely, His true temple, the Church, and He would put a sign of decay on the outward and visible in the temple of the first. Yet He declares by His servant, Haggai, that the glory of the second temple should be greater than the first. It certainly was not so as in respect of gold, or silver, or size, or excellency of architecture; and yet it truly was so, for the glory of the presence of Christ was greater than all the glory of the old temple’s wealth; and the glory of having the gospel preached in it, the glory of having the gospel miracles wrought in its porches by the apostles and by the Master, was far greater than any hecatombs of bullocks and he-goats-the glory of being, as it were, the cradle of the Christian Church, the nest out of which should fly the messengers of peace, who, like doves, should bear the olive branch throughout the world. I take it that the decadence of the old system of symbols was a most fitting preparation for the incoming of the system of grace and truth in the person of Jesus Christ. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3442.cfm