"The imagination only becomes becalmed if and when your tale has sailed you into lifeless waters, and you are too stubborn to throw pages away and start over. If your imagination is going into rebellion against you, start throwing pages of the manuscript away, starting with the most recent and moving backward. At a certain point, you will discover the writing block has vanished. Writer's block is your muse's way of telling you that your tale is going wrong. Listen to the muse and try a different approach."
January 1, 1970
https://en.wikiquote.org/wiki/Writer's_block