Who wrote this Love in your heart wasn't put there to stay Love isn't love till you give it away?

The quote is by Michael W. Smith, a singer/songwriter. It is in his song "Give It Away." The song can be found on two of his albums: "Change Your World" and "The First Decade: 1983 - 1993"

No...the quote is from Oscar Hammerstein. It is in the Reprise of "You are Sixteen" in the musical The Sound of Music.