Which lines from the passage support the theme “true strength is knowing when not to act”?

“Here is your part: at break of day tomorrow / home with you, go mingle with our princes.”
“The swineherd later on will take me down / the port-side trail – a beggar, by my looks, / hangdog and old.”
“If they make fun of me / in my own courtyard, let your ribs cage up / your springing heart, no matter what I suffer.”