“The man who might have written on this card once controlled Europe –  three short years ago when you were born. Today he is dead, his memory  despised, his country in ruins. He had a thirst for power, a low opinion  of man as an individual, and a fear of intellectual honesty. He was a  force for evil in the world. His passing, his defeat – a boon to  mankind. But thousands died that it might be so. The price for ridding  society of bad is always high. 
Love, Daddy.”

From ABC news:
"In what will likely go down as one of history’s mysteries, the CIA  Museum in McLean, Va., has obtained a letter from former intelligence  operative Richard Helms written in 1945 on Hitler’s stationery. Helms’  son, Dennis Helms, had received the letter when he was three years old  and gave it to the museum this year.
'Dennis doesn’t know exactly how he came to have [the stationery],'  said museum curator Toni Hiley. 'And we don’t have any information in  any of the publications on Helms where he’s referenced [to know] exactly  how he obtained it.'”

“The man who might have written on this card once controlled Europe – three short years ago when you were born. Today he is dead, his memory despised, his country in ruins. He had a thirst for power, a low opinion of man as an individual, and a fear of intellectual honesty. He was a force for evil in the world. His passing, his defeat – a boon to mankind. But thousands died that it might be so. The price for ridding society of bad is always high.

Love, Daddy.”

From ABC news:

"In what will likely go down as one of history’s mysteries, the CIA Museum in McLean, Va., has obtained a letter from former intelligence operative Richard Helms written in 1945 on Hitler’s stationery. Helms’ son, Dennis Helms, had received the letter when he was three years old and gave it to the museum this year.

'Dennis doesn’t know exactly how he came to have [the stationery],' said museum curator Toni Hiley. 'And we don’t have any information in any of the publications on Helms where he’s referenced [to know] exactly how he obtained it.'”