“The hell with the rules. If it sounds right, then it is.”

Source: Love, Rosie

The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting

Response received (after Edison spat on the floor and before he walked off) when M. A. Rosanoff joined the West Orange, New Jersey team in 1903 and humbly asked: “Mr. Edison, please tell me what laboratory rules you want me to observe.” M. A. Rosanoff’s quote appeared in Harper’s Monthly, September 1932, p. 24.
1900s
Variant: There ain´t no rules around here. We are trying to accomplish something.

Source: The Adventures of Huckleberry Finn

Source: The Likeness

Speech to the Third Army (1944)
Context: From time to time there will be some complaints that we are pushing our people too hard. I don't give a good Goddamn about such complaints. I believe in the old and sound rule that an ounce of sweat will save a gallon of blood. The harder we push, the more Germans we will kill. The more Germans we kill, the fewer of our men will be killed. Pushing means fewer casualties. I want you all to remember that.

Fortescue, J., Button v. Heyward (1722), 8 Mod. 24. This is in reference perhaps to Baker v. Pearce, 6 Mod. 23.
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Source: City of Heavenly Fire