People who think they have a number of faults may use that as an excuse to become passive and not try. But the combination is necessary. The danger of the Short Path is that he comes to think: "I am enlightened and have nothing more to do." It is another form of the ego. This happens often on the Short Path. So a balance between the Long and Short paths is most important.
-- Notebooks Category 23: Advanced Contemplation > Chapter 5: Balancing the Paths > # 172