This is a loving and romantic quote expressing a feeling of deep gratitude for someone. The speaker is saying that the person they are addressing is the answer to all of their prayers – like an answer to their wishes for something better and more meaningful. This person is also like a beautiful song, a dream, and a whisper – all of these things are special and valuable to the speaker and make their life worthwhile. The speaker expresses the deep appreciation they feel for this person, since without them they feel like they wouldn’t have been able to survive for very long.