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The main themes in the poem are the significance of the father-son bond and the loss and emptiness caused by its destruction. The speaker remembers so vividly the affectionate morning routine he shared with his father (Lines 1-10) in part because the paternal love and presence embodied in that routine were taken away from him at any early age. Visiting his father in prison only intensifies the boy’s confusion and frustration because a “never ending highway [and] high / Rusty gates” (Lines 13-14) mark the sudden distance and separation between them. His last glimpse at his father through the window of the prison visiting room signals the end of the boy’s happy childhood. The father’s absence and silence during the following 25 years have a profound effect on the speaker: “the little boy in [him] who still awaits his papa’s knock” (Line 29) prompts him to imagine a conversation between them.
If he had a chance while he was still a boy, the speaker would have told his father how much he missed him (Lines 30-31). He would have asked for advice about shaving, sports, and women (Lines 32-37). He would have modeled himself after his father (Lines 38-39). The adult speaker imagines saying all this to his father because now he fully realizes the immensity of the loss, the many ways that a present and loving father can facilitate a boy’s development into a man. With an absent father, he has had to teach himself a wide range of lessons, from shaving properly to resisting racism. The reference to race reminds the reader that, due to social inequities and incarceration policies, Black children in America are more likely to grow up without a father (or a stable parental presence of any kind) than other American children.
The speaker states explicitly that, in his father’s absence, he has had to rely on becoming his own father and teaching himself the lessons his father could not. He imagines telling his father: “I’m forgetting who you are” (Line 40), so I write this to “try to heal / And try to father myself” (Lines 42-43). The last part of the poem expresses the results of the speaker’s self-fathering. The advice he imagines his father giving him is really the speaker’s own independently acquired knowledge. It ranges from the mundane (shaving) to essential (fighting racism and poverty), but it conveys one pervading quality: confidence. Whether it is shaving “in strong deliberate strokes” (Line 48), believing in the “brilliance of your ballpoint pen” (Line 49), or walking “like a god” (Line 50) to attract an equally confident woman, “your goddess” (Line 50), all this behavior entails overcoming insecurity and self-doubt.
The speaker has learned that this faith in himself is essential, not only for being powerful as a man and a writer, but also for making a difference beyond his individual life: fighting against “racism and poverty” (Line 53) that blighted the lives of his father and many other Black Americans for generations. He has also understood that his father made choices that led to his incarceration and that he must have the strength not to repeat his father’s mistakes. He imagines his father telling him: “The best of me still lives in you / […] but you are not my choices” (Lines 59-60). The history will not repeat itself because the son’s self-fathering developed in him an awareness of what his father did wrong and a determination not to follow his example in that regard. Instead, the speaker commits to using his knowledge and confidence “to change this world” (Line 65), together with many others who wish to honor their fathers by embracing their qualities but overcoming their shortcomings.
Racism and poverty are two distinct social evils, but they reinforce each other in the lives of many people in the United States, especially Black Americans, so powerfully and persistently that one can hardly address one without the other. Black Americans are more likely to be in prison than white Americans, which is why the boy visiting prison in “Knock Knock” sees “a room of windows and brown faces” (Line 18). Many people spend months in jail awaiting a trial because they cannot afford to post bail. Moreover, poverty is a powerful motivator for criminal behavior. Even without knowing the exact circumstances of the father’s incarceration in “Knock Knock,” the reader can reasonably assume that poverty and racism played a part because the speaker involves them in his father’s imagined speech: “knock down doors of racism and poverty that I could not” (Line 53). The implication is that racism and poverty were contributing factors in the father’s choices that landed him in prison, but hopefully the son will cope with them in more productive ways. Out of respect for “the lost brilliance of the black men who crowd [prison] cells” (Line 55) and for the sake of both his father’s spirit and his children (Lines 56-58), the speaker will choose a better path and stay free, so he can be among those who will “change this world” (Line 65) in which being born Black and poor raises one’s chances of becoming an inmate or a fatherless child.