Then answered the Jews and said unto him, What sign shewest thou unto us, seeing that thou doest these things? Jesus answered and said unto them, Destroy this temple, and in three days I will raise it up. Then said the Jews, Forty and six years was this temple in building, and wilt thou rear it up in three days? But he spake of the temple of his body.
John 2:18-21
About twenty years before Jesus was born, Herod the Great launched a massive building program in Jerusalem. He was not well regarded by the Jewish people over whom he ruled because he was only half Jewish himself, so he decided to do something he hoped would increase his popularity. He turned the existing temple, that had been rebuilt by Zerubbabel after the Babylonian captivity, into a beautiful and massive structure. He more than doubled the size of the existing temple site and raised up a truly marvelous building to house the worship of God.
But by the time Jesus began His ministry, the biblical purpose for the temple of worship had been forgotten by most people. Instead, the temple was a site of display and commerce. Jesus drove the money changers out of the temple in a demonstration of His devotion to God. In response, the shocked crowd asked Him for a sign. Rather than simply seeking to follow what God had already revealed to them, they were looking for a new and spectacular message. Jesus told them that His resurrection would be that sign, but they missed the point.
Their view was limited to what was before their eyes. They did not understand that Jesus was the Messiah and Savior for whom they had been waiting. They were taken in by the beauty of Herod's temple, and in the process, they missed the beautiful Lord. It is easy for us to lose our focus in the Christian life. We can get caught up in the battles and struggles and fail to see what God is trying to teach us. We must be in tune with His Spirit to grasp His truth.