'maintain the discipline' is a correct and usable phrase in written English.
You can use it to express the idea of following a certain set of rules or standards. For example, you could say, "It is important to maintain the discipline in the classroom, so that the students can learn effectively."
"The only control you have is the ability to maintain the discipline of the search".
Yet too often pegs ended painfully, as overindebted economies found it impossible to maintain the discipline needed to protect them.
They would do better to keep a laser-like focus on the economy, but just can't seem to maintain the discipline.
"The second half was more down to, can we maintain the discipline, intensity and not allow them to come back early?
"It is difficult, and I don't deny that, to maintain the discipline when you would love to say that this programme will go ahead or I'm in favour of it.
The monasteries suffered most during this period, but the general turmoil of the time contributed to the failure of the church to maintain the discipline and integrity of religious life.
Bush, perhaps by virtue of his business education and experience -- and his years as, in effect, a junior White House staff member to his father -- is more personally engaged in sorting out the issues, maintaining the discipline and culling the misfits.
Dead Space 2, which is available for the PlayStation 3, Xbox 360 and Windows (I played mostly on Windows on a hunky rig from AMD), maintains the discipline of the original but orients it in a slightly different direction.
Next, Melissa Raines, who teaches at Liverpool University, gave a paper in which she examined the emotional valence of Eliot's punctuation and pointed out that Maggie's speech tends to devolve into dashes when she is most susceptible to the influence of Stephen Guest, her seducer, but maintains the discipline of periods, colons, and semicolons when her better nature is dominant.
Tharp like every professional dancer or athlete knows that not a day can go by without maintaining the discipline required by the body to stave off its gradual relaxation into lethargy.
He maintained the disciplined eating and exercise regime which had been forced upon him in jail.
