In the above image from a letter written when he was 37 years old, one can see a driven energy that seems impatient to express itself. There is a strong intellect too, which one can see from its quick letter connections and rhythmic use of space. There is scant effort to slow down the writing and to restrain itself. Intense emotions and ideas dominate.
A new biography by Catrine Clay 'Labyrinths' (2016) gives some fascinating facts about Jung the man and his relationships. His was apparently plagued by anxiety and fly into sudden rages. He would behave like a spoilt child at mealtimes, flicking peas across the table. Despite this, both patients and students regularly fell in love with him. In contrast, his wife emerges as a model of restraint. Her contribution to his life and in the development psychology is acknowledged at last last in this book.