not to be quickly shaken in your mind, nor yet be troubled, either by spirit, or by word, or by letter as from us, saying that the day of Christ had come.
or be troubled: "Troubled" (throeomai) means "to cry aloud, make a noise by outcry; in the New Testament to trouble, frighten...to be troubled in mind, to be frightened, alarmed" (Thayer 292-1-2360). Paul commands the Thessalonians not to be troubled (throeo), that is, they are not to be "frightened" or "alarmed" (Thayer 2922-2-2360) but to have a clear mind that they may have "the power of considering and judging soberly calmly and impartially" (Thayer 429-2-3563).