The narrator’s grandfather is a constant presence in Invisible Man because of some advice he gave on his deathbed. He tells the invisible man, “Live with your head in the lion’s mouth. I want you to overcome ‘em with yeses, undermine ‘em with grins, agree ‘em to death and destruction, let ‘em swoller you till they vomit or bust wide open” (16). These are the words to which the narrator returns over and over again, at first questioning whether or not his grandfather truly lived by this doctrine and then applying his own behavior to it, finding himself again and again agreeing and going along with whatever authority he finds himself subject to no matter the circumstances.
In the Brotherhood, the narrator has no trouble conforming at first. He seems to truly believe in the Brotherhood’s mission, and so when he is sent downtown to work on women’s rights, for example, he decides not to question it but to trust that he is still doing valuable work. Of course, he eventually discovers the truth about the Brotherhood, and he sees his role in their organization for what it really was. “[…] I no hero, but short and dark with only a certain eloquence and a bottomless capacity for being a fool to mark me from the rest; saw them, recognized them at last as those whom I had failed” (559).
So, the narrator failed the people of Harlem, and he likely failed his grandfather too. Throughout the novel, the invisible man finds many people to whom to look up. Bledsoe and Mr. Norton, his bosses at the paint factory, and of course the leaders of the Brotherhood all have a hand in shaping the narrator’s behavior. But as we discover throughout the course of the novel, none of them have his best interests at heart. Perhaps his grandfather was the only one who really did, and yet he was also the one the invisible man regards as the least credible. At the end of the novel, the narrator goes back to really examine what his grandfather might have meant. “Could he have meant—hell, he must have meant the principle, that we were to affirm the principle on which the country was built and not the men, or at least not the men who did the violence” (574). The principle, the narrator thinks, is greater and better than the men.
This is likely true about the Brotherhood. Their purported principles, like the ones America was built on, sounded great. On the surface, they fought for equality and they fought for peace. But their words and the narrator’s speeches were not enough to mean the organization was really working for the betterment of society. If the narrator had looked at his grandfather’s words more closely earlier in the novel, maybe he would have been able to agree them to death and destruction. The success of their purported ideals would surely have meant their death and destruction, because the black community would have been uplifted and given an equal platform on which to oppose the Brotherhood. The narrator can’t figure out whether or not his own death is tied to theirs. But their destruction might be worth the risk.

