at least from Medieval Latin to denote a statement under oath. age quod agis do what you do i.e., "do what you are doing," or "do well whatever you do...

Whatsoever things are true (Philippians 4:8) Saint Mary's University Age Quod Agis Latin What you do, do well St. Mary's University College, Calgary In Lumine...

illis: accurrit quidam notus mihi nomine tantum: arreptaque manu, 'quid agis, dulcissime rerum?' "I was walking by chance along the Sacred Way, as is...