Quaecumque sunt vera is Latin for, "Whatsoever Things are True" and is taken from Paul's Epistle to the Philippians, Chapter Four, beginning with Verse Eight:

Finally, brethren, whatsoever things are true,
whatsoever things are honest,
whatsoever things are just,
whatsoever things are pure,
whatsoever things are lovely,
whatsoever things are of good report;
if there be any virtue, and if there be any praise,
think on these things.