This is why so many bodies lay discarded all over the wilderness. If you think you stand be careful that you do not fall. But these Christians may not have been as strong as they might imagine. They might be vulnerable to temptation. In other words, Paul says there is no such thing as a superhuman or supernatural temptation.
Temptations are human experiences.
The term also carries the idea of usual or typical, as indicated by common. Temptations are never unique experiences to us. We can never have a temptation that has not been experienced by millions of other people. Circumstances differ but basic temptations do not. We are all in the same boat.