what is personification?
The act of giving a non-human object or thing human qualities.
The wind spoke in gentle whispers.
Personification gives human qualities to something non-human. The wind is not human and it is not possible for the wind to speak, but this sentence is suggesting that, like a human being, the wind did speak and it spoke in a whisper. The writer has used personification to imitate the sound of the wind and to indicate that it is a gentle and soft wind rather than a harsh one. The reader feels comforted by the softness of the wind and the personification creates a feeling of being less alone as though the wind itself has become a person.