Final answer:
The universal theme most present in Brutus’ lines from Shakespeare's play is that honor and public duty can necessitate difficult, personal decisions, which aligns with the theme 'Honor is the most valuable of attributes.'
Step-by-step explanation:
The speech by Brutus in Shakespeare's play Julius Caesar highlights a universal theme that centers around the conflict between personal love and public duty. Brutus argues that his assassination of Caesar was not out of a lack of love for Caesar but from a greater love for Rome and what he believed was best for the city-state. The theme present here is that honor and duty to one's country can sometimes necessitate difficult decisions, which aligns closest with the theme 'Honor is the most valuable of attributes.' However, the notion that words can be powerful and inspire action ('Words have the power to move mountains') may also resonate in the context of Brutus' persuasive rhetoric.