Could a main idea be "live every day as if it were your last"?

Please answer and explain.

Choose a theme addressed by the writers you have studied in this unit, such as coming of age, the conflict between greed and morality, the horrors of war, the injustice of racism, the excesses of materialism, or the divide between rich and poor. explain the relevance of this theme in today’s world and how it affects you. provide examples to support your position.