“Sweat saves blood, blood saves lives, but brains saves both.”

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.

Source: Hunted

Tactics and Strategy of the Latin American Revolution (1962)
Context: Cuba and Algeria are the most recent examples of the effects of armed struggle on the development of social transformation. If we conclude that the possibility of the peaceful road is almost nonexistent in the Americas, we can point out that it is very probable that the outcome of victorious revolutions in this area of the world will produce regimes of a socialist structure. Rivers of blood will flow before this is achieved... The blood of the people is our most sacred treasure, but it must be used in order to save more blood in the future.

To Col. Sam Fulkerson, who reported on the weariness of their troops and suggested that they should be given an hour or so to rest from a forced march in the night. (24 May 1862); as quoted in Mighty Stonewall (1957) by Frank E. Vandiver, p. 250
Context: I yield to no man in sympathy for the gallant men under my command; but I am obliged to sweat them tonight, so that I may save their blood tomorrow. The line of hills southwest of Winchester must not be occupied by the enemy's artillery. My own must be there and in position by daylight. … You shall however have two hours rest.

Lieber zuviel als zu wenig Spatengebrauch! Diese Arbeit spart Blut.
Source: Infanterie greift an (1937), p. 28.

To Leon Goldensohn, May 2, 1946, from "The Nuremberg Interviews" by Leon Goldensohn, Robert Gellately - History - 2004.

Source: Here, There Be Dragons

Reza Pahlavi's request to join in the Iran-Iraq war, 1980, as quoted in Farah Pahlavi (2004) An Enduring Love: My Life with the Shah, p. 396.
Attributed