what is the noun and verb which mean "to hold yourself back"

"There's a limit to my restraint"

"There's a limit to my patience"

Or, simply the noun "limit" can have this meaning in context, e.g.:

"I have my limits".

There are also variations of an idiomatic expression: "I'm at the end of my tether" meaning you are at the end of your patience with a situation or person.

There's a limit to my tolerance.

There is a limit to my forbearance.

Not especially idiomatic in the modern world, at least in my experience. This choice has a certain ... maybe "haughtiness" to it. Like if you were invoking the idea of someone in a position of power, this could help convey that sense.