The ultimate purpose of knowledge is to reduce human suffering [interview with a highly respected Indian cardiologist] Below: the Rambam–Maimonides

https://www.chabad.org/library/article_cdo/aid/904960/jewish/Yesodei-haTorah-Chapter-One.htm

1The foundation of all foundations and the pillar of wisdomאיְסוֹד הַיְסוֹדוֹת וְעַמּוּד הַחָכְמוֹת

is to know that there is a Primary Being who brought into being all existence. All the beings of the heavens, the earth, and what is between them came into existence only from the truth of His being.לֵידַע שֶׁיֵּשׁ שָׁם מָצוּי רִאשׁוֹן. וְהוּא מַמְצִיא כָּל נִמְצָא. וְכָל הַנִּמְצָאִים מִשָּׁמַיִם וָאָרֶץ וּמַה שֶּׁבֵּינֵיהֶם לֹא נִמְצְאוּ אֶלָּא מֵאֲמִתַּת הִמָּצְאוֹ: