When we are personally in between those two points, busy living our lives, we can forget the temporary nature of physical form. Sometimes we are brought back to this essential truth - a loved one passes or we hear about the death of a beloved leader.
Feelings of loss can run deep as we process the passing and reflect on how much the being added something special to our life experience. These feelings are normal and need to be honored. They are a part of life, too. When you feel grief, you can appreciate what was - which can help you to appreciate what is.
