【感悟译吧】不能超过师傅的徒弟是不幸的。不能让自己徒弟超越自己的师傅更是不幸。

A disciple not able to surpass his master is unfortunate. (是徒弟不幸。)
A master denying his disciples to surpass him is even more unfortunate. (是师傅不幸。)

It is unfortunate of a disciple not surpassing his master. (是没有超越师傅的行为不幸。)
It is even more unfortunate of a master denying his disciple to surpass him. (是师傅制止徒弟超越自己的行为不幸。)

Its unfortunate for the student unable to surpass his teacher.

Its even more unfortunate for the teacher unable to teach his student to surpass him.