People think I'm disciplined.
It is not discipline. It is devotion.
There is a great difference.
-- Luciano Pavarotti (1935-2007), Opera Singer
If we are learning something, we need to be disciplined in order to acquire the knowledge.
If we want to master a subject, we have to be devoted in order to apply what we acquired with perserverance.
If we are devoted in learning, we can succeed and be a master in any field.