This is, therefore, no time to be indifferent and complacent. This is not the time to be toying with the words of Jesus that "concerning that day and hour nobody knows, neither the angels of the heavens nor the Son, but only the Father." (Matt. 24:36)
Watchtower 1968 August 15 p.494 Why Are You Looking Forward to 1975?
"If you are a young person, you also need to face the fact that you will never grow old in this present system of things. Why not? Because all the evidence in fulfillment of Bible prophecy indicates that this corrupt system is due to end in a few years.
Awake!1969 May 22 p.15