Domesticated animals and pets recognize the voice of their master and learn to do so quickly. Charlie Frank raised the elephant Neeta from birth and trained her as a circus performer. On retirement he gave her to the San Diego Zoo. After they had not seen each other for fifteen years, a television crew filmed their reunion. Frank called Neeta from about a hundred yards away. She came to him immediately and performed her old routines on command. Her past experience gave her the power to recognize his voice.
Humans don't always do as well as animals in voice recognition …. But humans can learn to recognize God's voice just as they learn to recognize the color red, with its various shades and characteristics, and to distinguish it from blue or yellow. A musician learns by experience to distinguish a minor key from a major one simply by hearing a melody. We learn by experience to recognize God's voice.