Related:

• Ducharme's Precept: Opportunity always knocks at the least opportune moment.
• Opportunity always knocks at the least opportune moment. -- Ducharme's Precep
• Ducharme's Precept: Opportunity always knocks at the least opportune moment.
  Ducharme's Axiom: If you view your problem closely enough you will recognize yourself as part of the problem....
• Opportunity knocks but once.
• Opportunity knocks but temptation rings the bell.