|Remove the barriers...|
(Rashi). Literally, 'circumcise the foreskin of your heart.' That is, remove the barriers keeping you from the truth (Ibn Ezra; Ramban). Or, 'remove from your hearts' foolishness' (Targum), 'the evil urge' (Sukkah 52a), 'thoughts of sin' (Saadia), 'coarse desires' (Ibn Ezra), or, 'bad traits' (Bachya).
|ultimate Supreme Being|
Literally, 'God of Gods,' Elohey HaElohim in Hebrew. See Deuteronomy 4:35,7:9. Or, 'God of judges' (Targum), or, 'God of the angels' (Midrash HaGadol; Moreh Nevukhim 3:6; Ramban).
|highest possible Authority|
Literally, 'Master of masters.' Or, 'Master of kings' (Targum), or, 'master of all natural forces' (Bachya; cf. Moreh Nevukhim 3:6).
|does not give special consideration|
Even to the perfectly righteous (Bachya). Or, 'who does not automatically forgive sin' (Rashi).
Even of good deeds (Rambam on Avoth 4:22; Ramban). Thus, when a person does good deeds, it does not diminish the punishment for his sins (cf. Sotah 21a).
This is a special commandment to show love toward a proselyte (Sefer HaMitzvoth, Positive 207).