Here's a quote from the King James Bible (Philippians 4:8) that
EmoBorg may enjoy, as it was also a favorite of the Hitchmeister's:
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.
Then there's one of my personal favorite mantras, being simply:
Practice compassion.