From The Genius of Science, a portrait gallery of 20th century physicists by Abraham Pais.
So it came about that I met Pauli for the first time in Denmark, in early 1946, at a dinner party in Bohr's home. At that time he had already long been recognized as one of the major figures in 20th century physics ... I witnessed for the first time his chassidic mode, a gentle rhythmic to and fro rocking of the upper torso... "No, perhaps you don't know much, perhaps you don't know much." A moment later: "Ich weiss mehr" (I know more). That was said in the Pauli style, without aggression, merely an expression of a statement of fact.
More from Pais.