「自己中心的な(じこちゅうしんてきな)傲慢さ(ごうまんさ)は最後には(さいごには)自分自身を(じぶんじしんを)滅ぼす(ほろぼす)」ということ

Because all three were overconfident that they were the strongest and never tried to help others, no one came to save them when they fell into crisis. In the end, the three self-destructed due to their own egos and greed. Kenji teaches in this story that 'Self-centered arrogance eventually destroys oneself.'