The African Queen is a classic tale of man overcoming adversity. Rose and Charlie are both stranded in difficult, uncontrollable circumstances, yet emerge on the other side more highly developed in their moral characters and somewhat successful. They blow up the German sub, and more importantly they survive.
The plot holds implications of humanism. Because these people possessed intelligence and fortitude, they overcame adversity. Humanist philosophy propagates the idea that mankind is capable and possess all that is necessary to be and do whatever a person decides upon. People are sufficient within themselves to accomplish anything. Additionally, humanism holds to the idea that mankind is good; the humans are a good thing for this planet and retain value above anything other matter. In cinema, this philosophy looks like man vs. nature struggles, of which The African Queen is full.
Rose is the optimist. Holding fast to her faith, she determines to get out of her life-threatening circumstances unscathed. She believes that she can overcome her situation. By association, the salty sea-captain Charlie begins to believe the same. Together, they hatch a scheme to blow up the ever-threatening German boat and then sail away to safety. Naturally, the plot doesn't unfold according to their expectations, but they are somewhat successful in the end as neither die, and the Germans do. Propelled by hope, they persevere and are rewarded with life and vengeance.
This film sits in a prominent place in history. John Huston is a Hollywood legend from his day. Among his films, The African Queen figures prominently. He managed to make people feel strong emotional investment in a way few other directors of the time could accurately capture. Featuring stars like Bogart and Hepburn, the movie drew multitudes to the box office. In a very cinematically formative era, this film distinguished itself for its adherence to humanist values and Huston's realistic portrayal of the human experience.