What does Caesar mean when he says "What touches (concerns) ourself shall be last served" after Artemidorus urges him to read the letter that concerns Caesar? Knowing that Artemidorus' "schedule" (letter), names all the conspirators and warns Caesar (see Act 2.3), how does this doom him?

In Shakespeare's "Julius Caesar," the protagonist refuses to read Artemidorus' letter because he considers that personal matters are not a priority. In this manner, he dismisses Artemidorus as if he were insane and it is suggested that he should present the letter to the Congress. Thus, the fact that Caesar does not give preference to his own life weakens him and predicts his tragic fate, since he is now completely unaware of the plot to murder him and of the people that will turn agaist him.