"First and foremost, think before you speak to make sure you are speaking with good purpose. Glib talk disrespects others. Breezy self-disclosure disrespects yourself. So many people feel compelled to give voice to any passing feeling, thought or impression they have. They randomly dump the contents of their minds without regard to the consequences. This is practically and morally dangerous…Frivolous talk is hurtful talk; besides, it is unbecoming to be a chatterbox. ...It’s not necessary to restrict yourself to lofty subjects or philosophy all the time, but be aware that the common babbling that passes for worthwhile discussion has a corrosive effect on your higher purpose. When we blather about trivial things, we ourselves become trivial, for our attention gets taken up with trivialities. You become what you give your attention to."
-The Art of Living by Epictetus