Here's my suggestion for a motto:

IMPENETRABILITAS

This is the background for it. (I hope you enjoy meeting up with this again as much as I did):

"When I use a word," Humpty Dumpty said in rather a scornful tone, "it means just what I choose it to mean -- neither more nor less."

"The question is," said Alice, "whether you can make words to mean so many different things."

"The question is," said Humpty Dumpty, "which is to be master -- that's all."

...


"Impenetrability! That's what I say!"

"Would you tell me please," said Alice, "what that means?"

"Now you talk like a reasonable child," said Humpty Dumpty, looking very much pleased. "I meant by 'impenetrability' that we've had enough of that subject, and it would be just as well if you'd mention what you mean to do next, as I suppose you don't mean to stop here all the rest of your life."