Which lines in this excerpt from leo tolstoy the death of ivan ilyich demonstrate that gerasim is a character foil to ivan ilyich

The lines from the excerpt of Tolstoy’s "The Death of Ivan Ilyich" demonstrate that Gerasim is a character foil to Ivan Ilyich are the following:

'Gerasim alone did not lie; everything showed that he alone understood the facts of the case and did not consider it necessary to disguise them.'

Character foil is someone who contradicts the main character in order to highlight his qualities.