"without wrong": He did not create men to be wicked, but to be righteous, as it is written (Koheleth 7:29) "G-d made man just, but they sought many devices."
"Righteous and just is He": He deals justly with all of His creations.
Variantly: "The Rock": "the Resolute." "Perfect is His work": His work is whole with all creatures, and His ways are not to be brought into question. The slightest variation is not to be entertained regarding any of them — "What did the men of the generation of the flood see that brought the deluge upon them?" "What did the men of the Tower (of Bavel) see that caused them to be scattered from one end of the world to the other?" "What did the men of Sodom and Amorah see to be swept away by fire and brimstone?" "What did Aaron see that accorded him the priesthood?" "What did David see that accorded him kingdom?" "What did Korach and his congregation see to be swallowed up by the earth?"