When a person says, “Praise God from the heavens… Praise Him, all His angels. Praise Him, all His hosts…” (Psalms 148), he is calling all of them and commanding them to praise God. Thus, it is fitting that this stir a person to pray with heartfelt concentration, since he is inviting all the worlds to praise and extol the Holy One.
בְּשָׁעָה שֶׁאוֹמֵר: הַלְלוּ אֶת ה' מִן הַשָּׁמַיִם וְכוּ', הַלְלוּהוּ כָל מַלְאָכָיו, הַלְלוּהוּ כָּל צְבָאָיו וְכוּ'; אֲזַי הָאָדָם קוֹרֵא לְכֻלָּם וּמְצַוֶּה לְכֻלָּם שֶׁיְּהַלְּלוּ אֶת ה'. וּמִזֶּה רָאוּי לָאָדָם לְהִתְעוֹרֵר לִתְפִלָּה בְּכַוָּנַת הַלֵּב, מֵאַחַר שֶׁבִּתְפִלָּתוֹ קוֹרֵא לְכָל הָעוֹלָמוֹת לְהַלְּלוֹ וּלְשַׁבְּחוֹ יִתְבָּרַךְ:
When a person says, “Praise God from the heavens… Praise Him, all His angels. Praise Him, all His hosts…” (Psalms 148), he is calling all of them and commanding them to praise God. Thus, it is fitting that this stir a person to pray with heartfelt concentration, since he is inviting all the worlds to praise and extol the Holy One.