As a noble figure like Mrs. Curie ends her life, let's not just settle for remembering the contribution that her work has made to humanity. The significance of a first-class figure for the times and the historical process, in terms of its moral qualities Maybe more than mere intellectual achievement. Even the latter, they depend on the degree of character, far more than is commonly thought. What do they mean by "they" in "they depend on the degree of character . " in this paragraph? ['Significance of first-rate figures for the times and historical process.', 'Moral significance is greater than intellectual achievement.', 'Achievements in pure intelligence.', 'The quality far beyond ordinary people.']