His mind is settled upon him/ level-headed/ his mind is at ease
His mind is balanced and moderate. A person possessing good intellectual ability without disturbances or foreign influences.
(Rav Chiyya bar Ashi said in the name of Rav: “Anyone whose mind is not settled upon him – should not pray” – Eruvin 66a, and likewise: “He is an extraordinary elder, already having reached one hundred years, and his mind is still settled upon him” – Shalom Aleichem / Our friend Pini, etc., and also: “His mind settles upon him, and he feels the need himself to go out to the courtyard gate... and with a settled and clear mind he said to return to the incense offering that he had begun” – Byalik / Aryeh Baal Guf, 12, 37, likewise: “Whenever he prays, his mind was not settled and his intent was mixed up” – Chayim Savato / Like the Eyelids of Dawn, 135)
Translation
Expression (Hebrew)
דַּעְתּוֹ מְיֻשֶּׁבֶת עָלָיו
Definition (Hebrew)
דַּעְתּוֹ שְׁקוּלָה וּמְתוּנָה. בַּעַל יְכֹלֶת חֲשִׁיבָתוֹ טוֹבָה וּלְלֹא הַפְרָעוֹת אוֹ הַשְׁפָּעוֹת זָרוֹת.
("אָמַר רַב חִיָּא בַּר אָשֵׁי אָמַר רַב: כֹּל שֶׁאֵין דַּעְתּוֹ מְיֻשֶּׁבֶת עָלָיו - אַל יִתְפַּלֵּל"-עֵרוּבִין סה ע"א, וְכֵן:"זָקֵן מֻפְלָג הוּא, כְּבָר הִגִּיעַ לְמֵאָה שָׁנָה,וְדַעְתּוֹ עֲדַיִן מְיֻשֶּׁבֶת עָלָיו"- שָׁלוֹם עֲלֵיכֶם/ חֲבֵרֵנוּ פִּינִי, צה וְכֵן:"דַּעֲתוֹ מִתְיַשֶּׁבֶת עָלָיו וְהוּא מַרְגִּישׁ צֹרֶךְ בְּעַצְמוֹ לָצֵאת אֶל שַׁעַר חֲצֵרוֹ...וּבְדֵעָה מְיֻשֶּׁבֶת וּצְלוּלָה אָמַר לָשׁוּב אֶל מַעֲשֵׂה הַקְּטֹרֶת שֶׁהִתְחִיל בָּהּ"-בְּיָאלִיק/ אַרְיֵה בַּעַל גּוּף, יב, לז, כֵּן:"כָּל אוֹתָהּ תְּפִלָּה לֹא הָיְתָה דַּעְתּוֹ מְיֻשֶּׁבֶת וְנִתְעַרְבְּבָה כַּוָּנָתוֹ"-חַיִּים סָבָתוֹ/ כְּעַפְעַפֵּי שַׁחַר, 135)