John Lightfoot on Luke 11:33

[No man, when he hath lighted a candle, &c.] The coherence of this passage with what went before seems a little difficult, but the connection probably is this: there were some that had reviled him as if he had cast out devils by the prince of the devils, others that had required a sign from heaven, verses 15,16. To the former of these he gives an answer, verse 17,18: and, indeed, to both of them, verse 19, and so on. This passage we are upon respects both, but the latter more principally: q.d. "You require a sign of me: would you have me light a candle, and put it under a bushel? would you have me work miracles, when I am assured beforehand you will not believe these miracles? Which, however of themselves they may shine like a candle lighted up, yet, in respect to you that believe them not, it is no other than a candle under a bushel, or in a secret place."