Life is all about patterns, they are everywhere. Wallpaper too is about patterns (I know you can get pattern-free wallpaper, lining paper and such, but lets just go with the spirit of the post).
As I was saying, wallpaper is patterned, and when you are estimating how much you’ll need for a specific job you need to take account the pattern repeat. This is the distance as the paper rolls out between where the pattern ‘matches’ again; it affects the number of rolls you buy and the way you hang it, so it’s important to know.
Patterns in our lives recur at intervals too. You can’t see the future patterns until life unrolls around you (in which case it’s not the future, it’s now). But you can see the patterns if you look back.
You can learn a lot that way, but you must accept that patterns exist and be willing to see them.