וְאַתָּ֞ה אָמַ֤רְתָּ בִֽלְבָבְךָ֙ הַשָּׁמַ֣יִם אֶֽעֱלֶ֔ה מִמַּ֥עַל לְכֽוֹכְבֵי־אֵ֖ל אָרִ֣ים כִּסְאִ֑י וְאֵשֵׁ֥ב בְּהַר־מוֹעֵ֖ד בְּיַרְכְּתֵ֥י צָפֽוֹן׃
And thou saidst in thy heart: ‘I will ascend into heaven, Above the stars of God Will I exalt my throne, And I will sit upon the mount of meeting, In the uttermost parts of the north;
Ibn Ezra on Isaiah
I will ascend to heaven. An expression indicating the pride of the heart.
Rashi on Isaiah
on the mount of the assembly The mount where all assemble, i.e., Mount Zion.