Pietate nec Praedae

Often associated with Aeneas in Vergil's Aeneid, this Latin phrase translates to "Duty not Booty," and can be used when telling someone to not be distracted by a love interest, but rather to get their work done instead.

Paul: Dang, I'm gonna go out with Trish tonight, she is looking hot.
Tim: But don't you have work?
Paul: Screw work man!

Tim: Just remember Paul, Pietate nec Praedae.