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That is a statement of François Robichon de La Guérinière, (1688-1751) a French riding master who wrote a book about schooling horses.
It’s his conclusion when Guérinière talks about unwillingness in horses in his book.
He writes about timid horses, cowardice, laziness, malice, skittish horses, vicious, angry, stubborn, balky and obstinate horses.
Unwillingness in horses ordinarily results from two causes, according to Guérinière: either exterior faults or those that are interior.
Take a look what François Robichon de La Guérinière is saying:.