The meaning or message intended in "Whisper words of wisdom, let it be" is that we should not control others but guide them.
What the words mean
The meaning of the words in this message is that when we whisper words of wisdom, we should not become controlling in a bid to make others accept what we have said.
We rather should be understanding and peaceful while making room for others to accept our words of wisdom. The importance of this message is that being controlling will turn others off and take away from the intent of our message.