Mark, I do concede that Lee may have indeed said it. I just find it counter to what the man both wrote and stood for after the war. Both in his public and private lives. I believe that bitterness is a sin and I also believe Lee meant it when he wrote many times to his loved ones to trust in God and submit to his will.
Trust and submission... not many of us like the taste of that but believe me, when one puts his burdens on the shoulders of the Lord bitterness is one of the first things God removes from our heart. I don't now and have never seen bitterness in Lee.