"Assuming that his talent can survive the increasing strain, there is one scarcely avoidable danger that lies ahead of the pupil on his road to mastery"

This quote by Eugen Herrigel is referring to the journey of a trainee on their course to ending up being a master of their craft. Herrigel is cautioning that although skill is essential, it is not the only factor in accomplishing mastery. He is recommending that the trainee should be able to endure the increasing strain that includes the journey, as it is a tough and challenging procedure. He is warning that if the student is unable to deal with the stress, then they are in danger of not accomplishing proficiency. Herrigel is highlighting the importance of determination and devotion in order to reach the highest level of mastery. He is suggesting that although talent is very important, it is inadequate to ensure success. The trainee needs to be willing to put in the effort and devotion in order to reach their objectives.