Like people on earth, angels have discernment and volition. Heaven’s light produces their cognitive life because heaven’s light is divine truth and the divine wisdom that comes from it; while heaven’s warmth produces their volitional life because heaven’s warmth is the divine good and the divine love that comes from it. The quintessential life of angels is from the warmth, but not from the light except to the extent that there is warmth in it. We can see that life comes from the warmth because when the warmth is taken away life dies. It is the same for faith without love or for truth without goodness, since the truth that is attributed to faith is light and the goodness that is attributed to love is warmth.
All this becomes even clearer from the warmth and light of our world, to which heaven’s warmth and light correspond. From the warmth of our world, united to its light, all things on earth come to life and blossom. They are united in spring and summer. However, nothing comes to life or blooms from light separated from warmth—everything languishes and dies. They are disunited in winter, when the warmth is gone but the light remains. It is from this correspondence that heaven is called a paradise,108 because there the true is united to the good, or faith to love, as light is united to warmth in springtime on earth.
from Heaven and Hell, Section 136