The religious leaders of Jesus's day, the Pharisees, ignored the ancient prophecies and were not watching for His first coming.
They were much too comfortable with their earthly, exalted position. They did not necessarily desire the Messiah to come at that time as it would interfere with their role in the religious community.
Had they been watching according to the words of the prophets, they would have known to the exact date, the day of His visitation.
Since they did not, they missed His first coming just as many in the modern day church may miss His second coming.
The majority of the Church and the Church leadership have not heeded the dictates to "watch" and are therefore unaware of the the closeness of His return in these end times.
If the Pharisees had been watching for the prophetic fulfillment of the Scriptures they would have realized that it was the time for the visitation of their Messiah.
The book of Daniel actually provides the timeline for the advent of the Messiah:
The Coming King
Many today appear way too satisfied with this life on earth to even want to listen when they are approached with the blaring signs of the return of Jesus (including the leaders of the church).
As such, a majority of the modern day Church of Jesus Christ can be equated to be modern day Pharisees.
Remembering what Jesus thought of the Pharisees should cause us to not want to be guilty of the same:
Those who ignore the prophetic Scriptures and the signs of the times will miss the return of our Messiah just as the Pharisees did His first visitation.
May we maintain a diligent watch as He wants us to watch, so we can be aware of the nearness of His return.