Dig and Be Dug

I just learned that Langston Hughes had a Motto...

I play it cool
And dig all jive.
That's the reason
I stay alive.

My motto,
As I live and learn,
Is:
Dig and Be Dug
In Return.

Motto.  Great word.  And a totally hilarious thing to have.  And by hilarious I mean awesome.  Usually.  If it's a good, open-minded motto like dig and be dug in return.

Besides Langston Hughes and Calvin, who else has good mottos?  Who else has a motto at all?