What's the noun for stoicism? Here's the word you're looking for.
stoicism
A school of philosophy popularized during the Roman Empire that emphasized reason as a means of understanding the natural state of things, or logos, and as a means of freeing oneself from emotional distress.
“Moving between past and present, writing with self-restraint and stoicism, she reveals a history filled with pain.”
“The United player kept his counsel, winning back public opinion with his stoicism in the face of the insults.”
“That most shoulder this burden with little complaint says much for their courage and stoicism.”
stoic
(philosophy) Proponent of stoicism, a school of thought, from in 300 BCE up to about the time of Marcus Aurelius, who holds that by cultivating an understanding of the logos, or natural law, one can be free of suffering.