“Discipline and a questioning spirit can coexist in an individual.”

Discipline and a questioning spirit can go together. There is no inherent conflict between the two. If somebody is disciplined then one will have questioning spirit in a disciplined manner. Every discipline is with an objective. Discipline is not for discipline's sake. So, if one seeks to understand the fundamentals of a discipline there is no harm.

Another perspective

Discipline and questioning spirit cannot coexist. One cannot stick to any discipline if one does not take for granted the basic assumptions of a discipline. For example, one cannot follow and apply the principles of an art form if one keeps on questioning. Both cannot go together. Some sort of surrendering of the questioning spirit is required to be disciplined.