Or else in these words He typically sets forth the boldness of preaching, that no one should, through fear of fleshly ills, conceal the light of knowledge. For under the names of vessel and bed, he represents the flesh, but of that of lantern, the word, which whosoever keeps hid through fear of the troubles of the flesh, sets the flesh itself before the manifestation of the truth, and by it he as it were covers the word, who fears to preach it. But he places a candle upon a candlestick who so submits his body to the service of God, that the preaching of the truth stands highest in his estimation, the service of the body lowest.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Quæst. Ev. lib. ii. q. 12.