"I could never say in the morning, "I have a headache and cannot do thus and so". Headache or no headache, thus and so had to be done."

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If you are a physician and someone comes to see you with an absolutely incapacitating headache or a swollen arm, you don't tell them, "Come back in 10 years when I've completed my study and I'll see what I can do for you."

— Devra Davis