The phrase "amount of discipline" is correct and usable in written English.
It can be used when discussing the level or quantity of discipline required or exhibited in a particular context.
Example: "To succeed in this competitive environment, a significant amount of discipline is necessary."
Alternatives: "level of discipline" or "degree of discipline".
So it takes a certain amount of discipline.
The mayor conceded that pulling firefighters off the site "may require a certain amount of discipline".
This makes huge demands and requires a huge amount of discipline.
"We have adopted a certain amount of discipline and have had some success.
It takes a huge amount of discipline and hard work, especially from the performers.
It also added a certain amount of discipline to my lifestyle which aided my study".
My ideal of education is, in the end, what I got: a certain amount of disciplines, a certain amount of schooling, and then a lot of guidance from others".
But behind his prodigious output as a Supreme Court reporter, London bureau chief and, for more than three decades, Op-Ed columnist lay an enormous amount of disciplined hard work informed by this basic rule: to make major cases understandable and accessible to ordinary readers, he would first have to master their complexities.
"For our clay target shooters, there's only a minimal amount of disciplines, not the full range of clay target disciplines".
Its hallmarks include not only harrowing amounts of discipline and despair -- but drastic social deprivation as well.
When food is on the table in front of you, just like investor's money, it's hard to refuse it, but just as putting on a few extra pounds is much easier than subsequently losing the excess weight, "burn rates are very easy to increase but take large amounts of discipline and suffering to decrease". Be careful what you wish for.
