Matthew Henry Commentary Luke 11:29-36

"And when the multitudes were gathering together unto him, he began to say, This generation is an evil generation: it seeketh after a sign; and there shall no sign be given to it but the sign of Jonah. For even as Jonah became a sign unto the Ninevites, so shall also the Son of man be to this generation. The queen of the south shall rise up in the judgment with the men of this generation, and shall condemn them: for she came from the ends of the earth to hear the wisdom of Solomon; and behold, a greater than Solomon is here. The men of Nineveh shall stand up in the judgment with this generation, and shall condemn it: for they repented at the preaching of Jonah; and behold, a greater than Jonah is here. No man, when he hath lighted a lamp, putteth it in a cellar, neither under the bushel, but on the stand, that they which enter in may see the light. The lamp of thy body is thine eye: when thine eye is single, thy whole body also is full of light; but when it is evil, thy body also is full of darkness. Look therefore whether the light that is in thee be not darkness. If therefore thy whole body be full of light, having no part dark, it shall be wholly full of light, as when the lamp with its bright shining doth give thee light." — Luke 11:29-36 (ASV)

Christ promised that one more sign would be given, namely, the sign of Jonah the prophet, which is explained in Matthew as meaning the resurrection of Christ; and he warned them to heed this sign. But even if Christ himself were the constant preacher in any congregation and worked miracles daily among them, yet unless his grace humbled their hearts, they would not profit from his word.

Let us not desire more evidence and fuller teaching than the Lord is pleased to provide us. We should pray without ceasing that our hearts and understandings may be opened, so that we may profit from the light we enjoy. And especially take care that the light which is in us be not darkness; for if our leading principles are wrong, our judgment and practice must become more so.