The soul is subject to health and disease, just as is the body. The health and disease of both . . . undoubtedly depend upon beliefs and customs, which are peculiar to mankind.
MaimonidesWe each decide whether to make ourselves learned or ignorant, compassionate or cruel, generous or miserly. No one forces us. No one decides for us, no one drags us along one path or the other. We are responsible for what we are.
Maimonides