Angels are emotional beings
Angels are emotional beings. Job mentions that at the creation of the world the angels shouted for joy (Job 38.7). Then, do you recall after Jesus was born, how huge numbers of angels appeared to shepherds in the field rejoicing, praising and singing (Lk. 2.13–14)? One last example, Jesus was once in discussion with a group of tax collectors, sinners and the Pharisees about His mingling with sinners. Amongst other things, he tells them about how overjoyed the angels are when one sinner repents (Lk. 15:10).