Which is the topic sentence?多项选择题

Another trait that people need in order to achieve success is the ability to be passionately enthusiastic about the work they do.

Without passion, people will not have the drive or the joy necessary for creative thinking.

That quality is the key for many great innovators who made history, not because they were forced to do so, not even because they were thinking of financial rewards, but because they were passionately interested in their work.