Mark 13:1

Manner of stones; stones that were used in the building of the temple. These were immensely large. Josephus, the Jewish historian, who lived at that time, says some of them were twenty-five cubits long, eight thick, and twelve broad. The most firm and stable earthly structures are but temporary, and the most enduring earthly possessions come to an end. No one therefore should look to them as his chief good, or trust in them for happiness.