“Good is a good doctor, but Bad is sometimes a better.”
Considerations by the Way
Bartlett's Familiar Quotations, 10th ed. (1919)
Variant: Good is a good doctor, but Bad is sometimes a better.
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Ralph Waldo Emerson 727
American philosopher, essayist, and poet 1803–1882Related quotes
“Sometimes there are good reasons to do bad things.”
Source: Blacklisted

“When I'm good, I'm very good. When I'm bad, I'm better.”
I'm No Angel (1933)

“One good Art's better than a thousand bad.”
Fab. LVII: Of the Fox and the Cat
The Fables of Aesop (2nd ed. 1668)

“It is better to be a good human being than to be a bad one. It is just naturally better.”
My Heart's in the Highlands (1939)

Variant: There are two types of people in this world, good and bad. The good sleep better, but the bad seem to enjoy the waking hours much more.

“Because sometimes you have to do something bad to do something good.”
Source: The Complete Fairy Tales