A previously undiscovered letter written by Karl Rahner to his brother, Fr Hugo Rahner SJ, during the council in November 1963 has revealed that the French Intégristes - followers of Lefebvre - accused him and Fr Joseph Ratzinger as "heretic[s] who deny the existence of hell and are worse than Teilhardt de Chardin and the Modernists".
The letter, part of an exhibition in Munich, states that Rahner consoled himself with the knowledge that the pamphlet in which the accusation appeared also called Pope John XXIII "a harbinger of the Anti-Christ" and attacked Cardinal Giovanni Montini, the future Pope Paul VI.