Transcript follows.
Recommended reading: Dimensions Behind the Twilight Zone: A Backstage Tribute to Television's Groundbreaking Series.

Transcript
ROD SERLING
1490 MONACO DRIVE
PACIFIC PALISADES, CALIFORNIA
January 20, 1966
To Whom It May Concern:
Some twenty years of professional experience dictates the following position as regards the current form of feature length motion picture presentations on television. The wholesale and indiscriminate cutting of said films in order to arbitrarily permit commercials is in almost every case injurious to the continuity and clarity of the story lines. Unlike its television counterpart, the screenplay is not written with such commercial accommodations in mind. The television play is tailored to the standard format of a minimum three commercial messages per half hour of air time. "Curtains" are automatically inserted at points in the script so as to permit a commercial break. The screenplay, on the other hand, has had no such preparation. It is written for a continuous performance. The slicing, truncating and deletions that take place in the attempt to squeeze a full length motion picture into the television time frame absolutely distorts the value and quality of the motion picture.
Sincerely,
(Signed, 'Rod Serling')
Rod Serling
RS/ml