At best you can say, "Hey, look, my idea
has an INTERNAL logical consistency."
The Big Bang Theory Season 1, Episode 3
Internal jugular.
Money Heist Season 1, Episode 5
a record of the INTERNAL process
of their cognition.
Westworld Season 2, Episode 9
I'm plagued by an INTERNAL struggle.
The Big Bang Theory Season 8, Episode 6
According to the head of INTERNAL medicine
Money Heist Season 1, Episode 5