I’m never sure when to capitalize Stoic and when not to. It is a tricky one:
For the noun: Chambers dictionary says that you capitalize when talking about a disciple of Zeno, but not when referring to a stoical person. So, someone who takes part in Exeter’s Stoic Week is living like a Stoic, but someone who is resigned about the effects of old age is a stoic. That means that I try to live as a Stoic and as a stoic. Hmmm….
For the adjective the same distinction applies. Stoical is of the Stoics, while stoical is of indifference to pain or pleasure.
Then it gets more complicated: uncapitalized stoicism is the philosophy of the capitalized Stoics. The adverb stoically is uncapitalized.
As well as stoicism, there is a noun stoicalness. In my opinion there shouldn’t be.
To hell with all this! From now on I’m capitalizing Stoic and Stoical, in the same way I would Christian, regardless of context. I will also capitalize Stoicism in the same way I would Aristotelianism. I’m undecided on what to do with stoically.