Julius Caesar: soliloquy/aside
A soliloquy is a long speech delivered by a character while alone onstage or when no one onstage is listening.
This is Brutus' soliloquy, where he reveals that he doesn't have a personal motive for killing Caesar—other than "the general" pressuring Brutus into killing Caesar before Caesar goes mad with power.
In lines 45-62, Brutus reads a letter telling him to "Awake, and see [himself]!" and not let Rome fall under Caesar's rule. This reveals that the conspirator's plan to get Brutus on their side is working, and (in case certain members of the audience haven't noticed,) Brutus is easily manipulated.
Artemidorus is reading his letter to Caesar, warning him of the conspirators. This reveals that Artemidorus is concerned for Caesar because he knows about the conspirators, and (in case the reader didn't read the paragraph in the textbook) Artemidorus is a supporter of Caesar.
An aside is a remark made by a character to another character or the audience that other characters onstage do not hear.