We need to see that when God keeps his first and great commandment, he does not cease to keep the second commandment. The best way I know how to show this is to explain how God is holy, God is righteous, and God is love, and how these interrelate.
God is holy
When we describe God as holy, we mean he is one of a kind. There is none like him.
Moses taught Israel to sing: 'Who is like thee, O Lord, among the gods? Who is like thee, majestic in holiness, terrible in glorious deeds, doing wonders?' (Exodus 15.11). Centuries later, Hannah, Samuel's mother, taught Israel to sing: 'There is none holy like the Lord, there is none besides thee' (1 Samuel 2.2). Isaiah 40.25 says: 'To whom then will you compare me, that I should be like him?' says the Holy One.'