Likewise it is possible to spend valuable time speculating on matters concerning the future. One might ask, In what year will Armageddon begin?…Jehovah has not provided answers at this time. Do you think it wise for Christians to take time from more profitable Bible study to speculate on the answers? Consider the dangers…involves more than saving time. It may save your life…Personal theories can cause division of thought..By setting up hypothetical situations and then speculating..are we not in fact adding to Jehovahs words?..We cannot worship Jehovah in spirit and in truth if our worship is based on speculation. Truth and theory are not synonymous.
Watchtower June 15th, 1962 p.380-383