וּלְהוֹרֹת נָתַן וְגוֹ׳. פֵּרוּשׁ, לְצַד שֶׁיֵּשׁ חֲכָמִים רַבִּים שֶׁתִּהְיֶה חָכְמָתָם בְּלִבָּם לְבַד שֶׁלֹּא יֵדְעוּ לְלַמְּדָהּ, לָזֶה אָמַר וּלְהוֹרֹת נָתַן בְּלִבּוֹ הִשְׂכִּיל חָכְמַת הַלִּמּוּד. עוֹד בָּא לִשְׁלֹל מַה שֶׁכָּתוּב בְּיוֹמָא לח,א שֶׁל בֵּית גַּרְמוּ לֹא רָצוּ לְלַמֵּד עַל מַעֲשֵׂה לֶחֶם הַפָּנִים, שֶׁל בֵּית אַבְטִינָס לֹא רָצוּ וְכוּ׳, וְהוֹדִיעָנוּ הַכָּתוּב כִּי עַל אֵלּוּ יֵאָמֵר (משלי י:ז) ״זֵכֶר צַדִּיק לִבְרָכָה״, כִּי הָיוּ מוֹרִים וּמְלַמְּדִים כָּל הָרוֹצֶה. ולהורות נתן בלבו, and He equipped his heart with the ability to teach, etc. There are many great scholars whose wisdom is locked up in their hearts due to their inability to transmit it successfully to outsiders. The ability to teach is a great gift, and this is why the Torah testifies that G'd granted this gift to Betzalel. There is also a moral lesson contained in this verse not to act like certain members of the family of Bet Gormu who wanted to preserve their monoply on the intricacies of preparing the show breads by not teaching their craft to any non-family member. The Talmud severely critised their behaviour (Yuma 38). People who do teach their crafts qualify for the blessing expressed by Solomon in Proverbs 10,7: "The memory of a righteous person is a source of blessing."