Το λακωνίζειν εστί φιλοσοφείν
To be spartan is to philosophize.
I'm curious why λακωνίζειν needs to be nominalized and φιλοσοφείν doesn't.
λακωνίζειν gets nominalized when you want to discuss the concept itself (to act like a Spartan/speak laconically)
φιλοσοφείν often remains as an infinitive because it's describing an activity someone does or wants to do (to philosophize)