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For Kierkegaard, truth is a subjective reality which we must live, not simply something to consider and discuss. His self-consciousness and self-examination highlight the practical demands of existence, and he opposes the speculative thinking of philosophical idealists (especially Hegel). Kierkegaard urges the reader to commit to make choices about how to live. In Either/Or, he concentrates on sensual indulgence versus duty, the avant garde versus tradition. Fear & Trembling dramatically distinguishes between ethical and religious existence, based on the biblical story of Abraham. We must choose to be a "knight of infinite resignation" (giving up hope for this life). Kierkegaard says much of life's meaning depends not on external conditions, but on our internal choices about relating to them.