entia non sunt multiplicanda praeter necessitatem
Or in other words
entities must not be multiplied beyond necessity
This is also known as Ockham’s razor. The computer scientist mostly refers to the somehow similar KISS principle
keep it simple [and | ,] stupid
Even Einstein said something in that direction:
everything should be made as simple as possible, but no simpler
I just read source-code that reminded me to adhere to the common deeper meaning of all of these “sayings” to never produce code like the one I was looking at 
Du meinst doch nicht etwa die BenchIT GUI?
Nee – obwohl sich da auch einiges finden würde war es diesmal AnwenderCode auf einem Workshop