Psalms 71:19

וְצִדְקָתְךָ אֱלֹקים עַד מָרוֹם אֲשֶׁר עָשִׂיתָ גְדֹלוֹת אֱלֹקים מִי כָמוֹךָ

Your righteousness, G-d, reaches the highest heights. You have done great things, G-d - who is like You?

This is the middle verse of the Shabbos afternoon prayer “Tzidkascha.” Why does this verse use “Elokim” – which typically denotes G-d’s attribute of judgment – for the Name of G-d in this verse rather than “Hashem,” which describes His mercy? The Metzudas David explains that the Name used here denotes G-d’s ability to do absolutely anything. No one can prevent Him from performing His wondrous, righteous and, yes, merciful deeds.