Bill Clinton wrote about the letter then President George H.W. Bush wrote him as he took office in 1993.
On Jan. 20, 1993, I entered the Oval Office for the first time as president. As is the tradition, waiting for me was a note from my predecessor, George Herbert Walker Bush. It read:
"When I walked into this office just now I felt the same sense of wonder and respect that I felt four years ago. I know you will feel that, too. I wish you great happiness here. I never felt the loneliness some Presidents have described.
There will be very tough times, made even more difficult by criticism you may not think is fair. I'm not a very good one to give advice; but just don't let the critics discourage you or push you off course.
You will be our President when you read this note. I wish you well. I wish your family well. Your success now is our country's success. I am rooting hard for you."
Good Luck - George
Here is the letter left in the Oval Office January 20th, 1993