We can come to look upon the deaths of our enemies with as much regret as we feel for those of our friends, namely, when we miss their existence as witnesses to our success.Arthur Schopenhauer
Suffering by nature or chance never seems so painful as suffering inflicted on us by the arbitrary will of another.Arthur Schopenhauer
Friendship improves happiness and abates misery, by the doubling of our joy and the dividing of our grief.Cicero
What is deservedly suffered must be borne with calmness, but when the pain is unmerited, the grief is resistless.Ovid