Thomas Aquinas, on Ps 33:13

“Who is the man that desireth life: who loveth to see good days?”

“But what the effect of fear is, he shows first in speech. Second, in deed, at "Turn away." In speech he forbids two things: namely open evil and fraudulent good. As to the first he says, "Keep your tongue from evil," namely detraction, defamation, and error: Eph. 4: "Let no evil speech proceed from your mouth": Jas. 1: "If anyone thinks himself to be religious, not bridling his tongue," etc. As to the second he says, "And let your lips not speak deceit"; as if to say, do not even utter good things deceitfully: Ps. 11: "May the Lord destroy the deceitful tongue." And note that he first speaks of restraining the tongue, and then of the lips: because first one moves the tongue when one wishes to speak, and then the lips. Likewise, the tongue first forms words, but the lips distinguish them.”

Imported from an open dataset — not yet checked against the printed edition.