A loose and glib tongue easily becomes the vehicle of blasphemy and murmuring. The tongue that wags will be guilty of perjury, lying and detraction. The sin of flattery is easy to it. So too, cursing, abusive language, quarrelsome words, and words which mockingly contemn virtue and entice to evil deeds. Scandalous gossip, vain boasting, the divulging of secrets, idle threats, rash promises, frequent and silly chattering and scurrilous conversation : all these sins come lightly, smoothly, and easily from an unguarded tongue.
--St. Bonaventure, Holiness of Life