“Don't lose temper with the horse — this ultimately defeat your best intentions.”
The Natural Horse (1997)
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Jaime Jackson 12
Horse hoof care professional 1947Related quotes
“When you lose your temper, you lose a friend. When you lie, you lose yourself.”
Harvest Moon
“A bad-tempered man will never make a good-tempered horse.”
Black Beauty (1877), Ch. VII, p. 36

Variant: You are educated when you have the ability to hear almost anything without losing your temper, or your self-confidence.
“Don’t lose your temper,” said Ruell evenly. “It’s your worst fault, except for ignorance.”
Source: A for Anything (1959), Chapter 7 (p. 88)

Source: Who Stole Feminism?: How Women Have Betrayed Women

“Men are like steel — when they lose their temper, they lose their worth.”
Though often attributed to Norris, this seems to have appeared as an anonymous proverb at least as early as 1961, in an edition of The Physical Educator
Misattributed

“Don't let your actions betray your intentions.”
Ron English's Fauxlosophy: Volume 2 (2022)