VaEtchanan-HaKetav v’HaKabalah: Mitzvah 418 – Concept 4: Loving God: No Room For Other Desires
Haketav V’Hakaballah (Genesis 49:9) describes two different paths in serving God: There is the person who walks steadily with great strength and self-control, and is consistent in his service. There is another person whose heart is so filled with love of God that there is no room for other desires.