Heart of hearts
if you know something in your heart of hearts, you are certain of it although you might not want to admit it.
Example:
I knew in my heart of hearts that something was wrong, but I just wasn't ready to deal with it. Do you believe in your heart of hearts that things will get better?
I knew in my heart of hearts that something was wrong, but I just wasn't ready to deal with it. Do you believe in your heart of hearts that things will get better?