כִּֽי־אָמַ֗רְתִּי ע֭וֹלָם חֶ֣סֶד יִבָּנֶ֑ה שָׁמַ֓יִם ׀ תָּכִ֖ן אֱמוּנָתְךָ֣ בָהֶֽם׃
For I have said: 'For ever is mercy built; In the very heavens Thou dost establish Thy faithfulness.
Pirkei Avot
Shimon the Righteous was one of the last of the men of the great assembly. He used to say: the world stands upon three things: the Torah, the Temple service, and the practice of acts of piety.