From pg 27 of Peter Sloterdijk’s The Art of Philosophy.
Witnesses report that Socrates had the habit of “sinking” into thought, as if thinking involved a kind of trance or obsessive daydream. According to Xenophon, Socrates saw this as “concentrating the mind on itself” by breaking off contact with his environment and becoming “deaf to the most insistent address.” Once, during a military camp to which he was called up as part of his duty as an Athenian citizen, he is supposed to have stood still on the spot for twenty-four hours. All the while, he was lost in the inner activity that people around him regarded as ridiculous yet amazing, and perhaps even numinous.
Mark Carrigan 