Possible Clues:

• Sam Shepard's '___ of the Mind'
• Part of a February phrase
• "It's a Sin to Tell __"
• ''Father, I cannot tell ___''
• “I cannot tell __”
• ''--- of the Mind'' (Sam Shepard play)
• It's a sin to tell _____
• "I cannot tell ___!" (apocryphal Washington quote)
• 'In the cunning, truth's itself ___': Pope
• ". . . sin to tell ___"