Transcript:
Snoopy walks up to Charlie Brown with a book in his mouth. The latter asks, "Is it time for our daily reading session, Snoopy?"
He sits in a chair and patted the empty spot next to him. He says, "O.K., climb up here in the chair...." Snoopy jumps up into the chair.
Charlie Brown looks at the book and says, "Oh, No! Not again!!"
He looks at a guilty Snoopy and continues, "Just for once, can't we read something besides Albert Payson T??"
Original comic:
For anyone else unfamiliar with the author:
https://en.wikipedia.org/wiki/Albert_Payson_Terhune