Midrasz do Przysłów 26:4

The sages wanted to suppress (declare uncanonical) the Book of Proverbs also, because of its contradictions. Why did they not suppress it then? They said: "Have we not scrutinized the Book of Ecclesiastes and found explanations of the contradictions? Let us search the Book of Proverbs also, until we find explanations." Which are its contradictory words? It is written (Pr. 26, 4.) Do not answer a fool according to his folly, and it is also written (Ib.) Answer a fool according to his folly. [After a study they came to the conclusion that] there is no contradiction; the latter refers to matters of the Torah and the former refers to secular matters. In what respect can the subject of the Torah be explained? In the following way: Rabban Gamaliel was once sitting and lecturing: "In the future women will give birth to children every day, as it is written (Jer. 31, 7.) The pregnant woman and she that travaileth with child together." A certain disciple sneered at him and said: There is nothing new under the sun (Ecc. 1, 9). Whereupon Rabban Gamaliel said to him: 'Come, I will show thee the like thereof in this world." He went and showed him a hen. Again Rabban Gamaliel lectured: "In the future the trees will bring forth fruit every day, for it is said (Ezek. 17. 23.) And it shall produce boughs, and bear fruit, i.e., just as boughs are produced every day so also will fruit be brought forth every day."' Again that disciple sneered at him and said: There is nothing new under the sun (Ecc. 1, 9). "Come," said Rabban Gamaliel to him, "I will show thee the like thereof in this world." Whereupon he went and showed him a Caper-bush. Upon another occasion Rabban Gamaliel was sitting and lecturing: "In the future Palestine will produce ready-made cakes and fine woolen garments, as it is said (Ps. 72, 16.) There shall be an abundance of corn in the land." The disciple again sneered at him and said: There is nothing new under the sun. "Come," said Rabban Gamaliel, "I will show thee the like thereof in this world." Whereupon R. Gamaliel took him and showed him mushrooms and as to [something corresponding to] garments, as it said (Ps. 72, 16.) There shall be palm-shoot [which is covered in the form of garment].