The cucumber is bitter? Then throw it out. There are brambles in the path? Then go around them. That's all you need to know. Nothing more. Don't demand to know "why such things exist." Anyone who understands the world will laugh at you, just as a carpenter would if you seemed shocked at finding sawdust in his workshop, or a shoemaker at scraps of leather left over from work.
Marcus AureliusSince it is possible that thou mayest depart from life this very moment, regulate every act and thought accordingly. But to go away from among men, if there are gods, is not a thing to be afraid of, for the gods will not involve thee in evil; but if indeed they do not exist, or if they have no concern about human affairs, what is it to me to live in a universe devoid of gods or devoid of Providence? But Gods there are, undoubtedly, and they regard human affairs; and have put it wholly in our power, that we should not fall into what is truly evil.
Marcus Aurelius