The vital difference is one of perspective. Caregivers would be well served to ask how they viewed themselves. The difference is gigantic when it comes to the power to cope. Depending upon one's outlook one can become either bitter or better. My experience in working with caregivers over several decades drives this fact home.
Caregivers tend to look upon the life they live as either a gift or an entitlement.
If they look upon their life as an entitlement, something due them because the were born upon this earth, then every difficult situation, every accident, every disease, every physical or emotional setback, is looked upon as an unwelcome and undeserved intrusion upon their deserved happiness. Such persons typically become critical, cynical and bitter. They tend to blame God, the physicians, even the person to whom they offer care, for their own bitter fate. On the other hand, there are those who look upon life as a gift, a boon, something so splendid and undeserved that every breath is a blessing and every hour, an honor. I am your child, have your own way.