Lyndon Johnson actually said...

My regret at your leaving is tempered by satisfaction in the knowledge that you intend to continue your service to your country.

No single Congress in my memory has done so much to keep America as a good and wholesome and beautiful place to live.

It is with regret that I have received your resignation.

The land and water conservation bill assures our growing population that we will begin, as of this day, to acquire on a pay-as-you-go basis ...