The two lines in Li Sao that expressed the author's unwavering determination and perseverance in his ideals and career were: ``` It's also what I like in my heart. Even if I die nine times, I still don't regret it. ``` These two lines came from the last chapter of Li Sao, which showed Qu Yuan's firm belief and indomitable spirit. Even in the face of the threat of death, he still pursued his ideals and career without wavering. This sentence expressed the author's fanatical pursuit of his career and his firm determination to show his fearless spirit of sacrifice.