i remember when he made a "surprise " visit to the UK.
the congregation had to organise a coach at short notice to get us to London one weekday evening--probably about 1964 . it was at a big open venue--maybe twickers. he gave a very interesting talk--called---- " you must not forget"
he kept repeating that--as a sort of punchline "you must not forget"
ive never forgot that. no idea what he was on about though.