It’s usually not one or the other in isolation, but lack of discipline tends to do more long-term damage when opportunity is present. Many people have chances at some point, but without consistency, focus, and effort, they can’t turn those chances into results. On the other hand, lack of opportunity can slow progress, but disciplined people often find or create openings over time. In reality, discipline acts like the multiplier—opportunity matters, but discipline decides what you do with it.