References in classic literature ?
Presently the knock was repeated, and then we heard these words in a guarded voice:
At first they were guarded in their talk, but after they had heard my agent and me conversing in English they dropped their reserve and I picked up many of their little confidences; no, I mean many of HER little confidences--meaning the elder party--for the young girl only listened, and gave assenting nods, but never said a word.
One is so fenced and guarded from the weather, that not a breath of air can find its way unpermitted.