Where did John Lennon get that line...;half of what I say is meaningless...?.

From the book the Prophet by Kahlil Gibran

other wisdoms is if we were to follow the Old Testament 'an eye for an eye'
the whole world would be blind

Sting also used a line from the Prophet '...if you truly love somebody you should set them free,'

And where do you fine truth?  In a labourer's hand