It is assumed that Jesus is speaking about the people looking at what he shows them and hearing what he tells them. Alternate translation: "when they look at what I am doing ... when they hear what I am saying" (See: [[rc://en/ta/man/translate/figs-explicit]])
Jesus speaks of people understanding what they see as actually seeing. Alternate translation: "they look and do not understand" (See: [[rc://en/ta/man/translate/figs-metaphor]])