פִּ֤י ׀ יְסַפֵּ֬ר צִדְקָתֶ֗ךָ כָּל־הַיּ֥וֹם תְּשׁוּעָתֶ֑ךָ כִּ֤י לֹ֖א יָדַ֣עְתִּי סְפֹרֽוֹת׃
My mouth shall tell of Thy righteousness, And of Thy salvation all the day; For I know not the numbers thereof.
Read midrashic interpretation of Psalms 71:15: and classical rabbinic exegesis.