"A thousand-mile horse also needs Bole" means: The world needs eyes that are good at discovery, as shown in the figure. A talented person (a thousand-mile horse) needs someone (Bole) to discover and appreciate him before he can show himself.
The words "Qianlima" and "Bole" come from "Warring States Policy·Chu Ce IV". The original text is: When Bole encounters it, he gets off the car and climbs up to cry, and unties his clothes to cover it. Ji then spurts out, raises its head and screams, the sound reaches to the sky, if it makes the sound of gold and stone, why is it? He saw Bole's confidant.
The vernacular translation is: The thousand-mile horse is old and he drives a cart filled with salt to climb the Taihang Mountains. Its hooves were stiff, its knees were broken, its tail was soaked, its skin was ulcerated, saliva spilled on the ground, and sweat flowed all over its body. After being whipped, I climbed to the middle of the mountain road and could no longer go up.
Bole met it, jumped out of the car, hugged it and cried bitterly, and took off his linen clothes to put on it.
The horse lowered his head and sighed, then raised his head and screamed loudly. The sound went straight up to the sky, making a loud sound like gold and stone colliding. Why is this? He knows that Bole is his confidant.
Extended information
Article about Bole and Chollima: "Horse Theory"
There was Bole in the world, and then there was the Chollima. A thousand-mile horse often exists, but a bole does not always exist. Therefore, even though there is a thousand-mile horse, it will be carelessly grown and be dead in a stall, never being called as a thousand-mile horse.
A horse that travels a thousand miles can eat as much grain as a stone. Those who eat horses don’t know that they can travel thousands of miles and eat. Although this horse is capable of running a thousand-mile, it is not full of food, has insufficient strength, and its talent and beauty are not visible, and it is impossible to be equal to an ordinary horse. How can you expect it to be able to run a thousand-mile?
If the horse is not driven according to the right way, if the food is not used to its full potential, if the sound of the horse is not understood, the horse will come upon it and say: "There is no horse in the world!" Woohoo! Is there really no horse evil? In fact, I really don’t know about horses!
Vernacular translation:
There is a bole (first), and then there is a thousand-mile horse. A thousand-mile horse often exists, but a Bole does not always exist. Therefore, even if there is a noble horse, it will be humiliated in the hands of servants and die in a stable together with ordinary horses, and it will not be known as a thousand-mile horse.
A horse that travels thousands of miles in a day can sometimes eat a stone of grain in one meal. The person who feeds the horse does not know that it can travel thousands of miles (like an ordinary horse) to feed it.
Even if such a horse has the ability to run thousands of miles a day, it is not full of food and has insufficient strength. Its talents and good qualities will not be able to express itself. If it wants to be like an ordinary horse and it cannot do it, how can it be expected of it? (Day trip) What about thousands of miles?
Do not whip it according to the correct method (to drive a thousand-mile horse), feed it but fail to exhaust its talents, listen to the horse's neighing, but cannot understand its meaning, face it with a whip and say: "The world There is no thousand-mile horse!" Alas! Is there really no thousand-mile horse? Maybe he really doesn’t know Chollima!
Baidu Encyclopedia - Chollima and Bole