I always found Fulxanelli’s retelling of the story of Saint Christopher (aka Offerus) to be one of the best examples of this principle in action.
Offerus is a big bulky dude, built like an outback steakhouse, and he likes to travel around, see the sights, but he wants to serve the biggest baddest most feared master of them all.
So he proceeds through the lesser to the greater bad guys until he finds out they’re scared of the Devil, and so he decides to serve the Devil, who just happens to rob stagecoaches. During his adventures with the Devil, he finds out that he himself is scared of you know who. So Offerus, not to be tied to any contract with the man downstairs, tells him where to go and heads off to find Christ.
He meets a hermit, who tells him that Christ is found through prayer, and fasting, and watching. Offerus says “is there no other way than these”? and then the hermit, understanding who he was dealing with, takes him to a river where he is essentially offered karma yoga - help all the pilgrims who come this way to get across this perilous river, and if you do this for Christ you will get what you seek.
The story then proceeds from there, ending with Offerus being christened Saint Christopher. It’s a story from a very early version of the Golden Legend.
The multiple ways of climbing the mountain seems to have at least crossed from India into Europe, but who really knows where it originated? But it does seem like something similar to the schools of Yoga for ordinary mystics did exist in the first couple of centuries AD and found its way into the later accounts of the lives of the saints.