Here's German veterinarian and professional rider Gerd Heuschmann in the 2007 English edition of his book Tug of War: Classical Versus “Modern” Dressage:
I do not understand how, just because someone is a horse enthusiast, he or she is allowed to mount a horse without having any previous education whatsoever, and calls himself or herself a “rider” from that very moment on. Imagine this approach applied to the sport of hang gliding or diving! And, such disciplines to not involve another living individual creature that, on the one hand, is very strong, yet on the other, very delicate and sensitive. (123)
The original 2006 German version of this book carried the provocative and easily translated title Finger in der Wunde.