A quote
That is why certain brave men, most willing to shed their own blood, cannot bear to see the blood of others. Some persons collapse and faint at the sight of a freshly inflicted wound; others are affected similarly on handling or viewing an old wound which is festering. And others meet the sword-stroke more readily than they see it dealt.
Seneca·Letter 57 — On the Trials of Travel (§5)·trans. Gummere