In Chinua Achebe's 'Things Fall Apart,' the main character Okonkwo struggles against his fear of weakness and his father's legacy, leading to his tragic downfall. The novel illustrates the clash between traditional Ibo culture and the changes brought by British colonization and Christianity, which Okonkwo vehemently opposes. Ultimately, his refusal to adapt results in personal and societal collapse, culminating in his suicide, which symbolizes the broader disintegration of his culture.