I would say that...
In the question: I would have thought that..., it is possible to assume that...
("Moses said before the Holy One, blessed be He: Lord of the world, if You had not sworn to them by heaven and by earth, I would have said, 'As the heavens and the earth endure, so your oath is in vain.' And now that You have sworn to them by Your great name, what is Your great name, which lives and endures forever, and for worlds of worlds, so your oath stands forever. "And for the worlds of the worlds" - Blessings of the Heart (A.)
Translation
Expression (Hebrew)
הָיִיתִי אוֹמֵר ש...
Definition (Hebrew)
בְּהַשְׁאָלָה: הָיִיתִי חוֹשֵׁב שֶׁ..., נִתָּן לְהַנִּיחַ הָיָה ש...
("אָמַר מֹשֶׁה לִפְנֵי הַקָּדוֹשׁ בָּרוּךְ הוּא: רִבּוֹנוֹ שֶׁל עוֹלָם, אִלְמָלֵא נִשְׁבַּעְתָּ לָהֶם בַּשָּׁמַיִם וּבָאָרֶץ הָיִיתִי אוֹמֵר כְּשֵׁם שֶׁשָּׁמַיִם וָאָרֶץ בְּטֵלִים- כָּךְ שְׁבוּעָתְךָ בְּטֵלָה. וְעַכְשָׁו שֶׁנִּשְׁבַּעְתָּ לָהֶם בְּשִׁמְךָ הַגָּדוֹל, מָה שִׁמְךָ הַגָּדוֹל חַי וְקַיָּם לְעוֹלָם וּלְעוֹלְמֵי עוֹלָמִים- כָּךְ שְׁבוּעָתְךָ קַיֶּמֶת לְעוֹלָם וּלְעוֹלְמֵי עוֹלָמִים"- בְּרָכוֹת לֵב ע"א)