Charles Spurgeon Commentary Luke 21:1-6

"And he looked up, and saw the rich men that were casting their gifts into the treasury. And he saw a certain poor widow casting in thither two mites. And he said, Of a truth I say unto you, This poor widow cast in more than they all: for all these did of their superfluity cast in unto the gifts; but she of her want did cast in all the living that she had. And as some spake of the temple, how it was adorned with goodly stones and offerings, he said, As for these things which ye behold, the days will come, in which there shall not be left here one stone upon another, that shall not be thrown down." — Luke 21:1-6 (ASV)

This was literally true of the temple at Jerusalem; and today there remains nothing of it. It is also true of all earthly buildings and of all earthly things. However firm they appear to be, as though they might outlast the centuries themselves, yet the things which are seen are temporal, and like the baseless fabric of a vision, they shall all melt into thin air, and pass away. The things which are seen are temporal; but the things which are not seen are eternal.