This is taken from the Tanya. “Abraham epitomizes Chesed, the attribute of kindness; Isaac epitomizes Gevurah, the attribute of severity; the predominant attribute of Jacob is Tiferet, or Rachamim, compassion. The inward aspect of the soul’s divine service when motivated by Chesed is — the love of G‑d; the inward aspect of the soul’s divine service when motivated by Gevurah is — the awe of G‑d; so, too, divine service when motivated by compassion has its distinctive inward aspect “Love is internal and kindness is external. So, too, with regard to fear and severity [— the former is internal; the latter, external], as explained in Iggeret HaKodesh, Epistle 15, p. 123a.” (— Note of the Rebbe.)
This means G-d is kindness. G-d’s love is expressed through HIS kindness.