How are spirit guides chosen?

Every soul that has been and is to be born upon the earth plane has allocated to it a spirit guide. 

Spirit guides constitute one of the grandest orders in the whole organisation and administration of the spirit world. 

The principal guide is chosen for each individual on the earth plane in conformity with a fixed plan. 

Most guides are temperamentally similar to their charges in the latter's finer natures, but what is most important the guides understand and are in sympathy with their charges’ failings. Many of them indeed had the same failings when they were incarnate, and among other useful services they try to help their charges overcome those failings and weaknesses.