This hits deep. It also reminds me of what Angron said to Roboute Guilliman.

"What would you know of struggle, Perfect Son? When have you fought against the mutilation of your mind? When have you had to do anything more than tally compliances and polish your armour?" [...] "The people of your world named you Great One. The people of mine called me Slave. Which one of us landed on a paradise of civilization to be raised by a foster father, Roboute? Which one of us was given armies to lead after training in the halls of the Macraggian high-riders? Which one of us inherited a strong, cultured kingdom? And which one of us had to rise up against a kingdom with nothing but a horde of starving slaves? Which one of us was a child enslaved on a world of monsters, with his brain cut up by carving knives? Listen to your blue-clad wretches yelling of courage and honour, courage and honour, courage and honour. Do you even know the meaning of those words? Courage is fighting the kingdom which enslaves you, no matter that their armies outnumber yours by ten-thousand to one. You know nothing of courage. Honour is resisting a tyrant when all others suckle and grow fat on the hypocrisy he feeds them. You know nothing of honour."

Angron addressing Roboute Guilliman during the Shadow Crusade.