The quote below is a claim made by The Watchtower Society during the 1975 campaign. In the same magazine where the article What Will the 1970's Bring? appeared, we may find another article: A Time to 'Lift Up Your Head' in Confident Hope, in which Jehovah’s Witnesses organization assures us that its explanation applying to the imminent end is credible. Let it speak for itself:
True, there have been those in times past who predicted an "end to the world," even announcing a specific date. Some have gathered groups of people with them and fled to the hills or withdrawn into their houses waiting for the end. Yet, nothing happened. The "end" did not come. They were guilty of false prophesying. Why? What was missing? Missing was the full measure of evidence required in fulfillment of Bible prophecy. Missing from such people were God's truths and the evidence that he was guiding and using them. But what about today? Today we have all of it. And it is the evidence required, overwhelming! All the many, many parts of the great sign of the "last days" are here, together with verifying Bible chronology. (Awake! October 8, 1968, p. 23).
Interestingly, after the year 1975 Watchtower Society was not so confident and admitted:
Some opposers claim that Jehovah’s Witnesses are false prophets. These opponents say that dates have been set, but nothing has happened. (...) Yes, Jehovah’s people have had to revise expectations from time to time. Because of our eagerness, we have hoped for the new system earlier than Jehovah’s timetable has called for it. (The Watchtower March 15, 1986, p. 19);
Jehovah’s Witnesses, in their eagerness for Jesus’ second coming, have suggested dates that turned out to be incorrect. Because of this, some have called them false prophets. (Awake! March 22, 1993, p. 4).