Take a piece of paper, thin, flat, flimsy, soft. But when its a brand new piece of paper, and if you're not careful.. it can cut!
My wife has had a paper cut... in her eyes! Hurts like H***! Every now and then she still has watery eyes because of that legendary bruise. But that was because of a paper cut in - probably the most sensitive part of the outer human body.
It reminds us though that sometimes its not always the biggest problems in life that haunts us daily. Sometimes the smallest of problems - though not a pain in the A*** - can be a tormenting experience simply because the problem is prolonged! Like a paper cut in the folds of your fingers - tiny, but that lingering problem can be a real torture simply because it is perpetuated.
So if you are caught in a situation that might just be a small problem, try your best to solve it and move on! Lingering problems can sometimes simmer into a gargantuan ruin!