The pain that hurts may refer to the physical and emotional suffering that individuals experience in their everyday lives. It may include physical injuries, heartbreak, disappointment, or trauma. This type of pain is immediate and can be intense, but it doesn't necessarily change a person in a profound way.

On the other hand, the pain that alters refers to the kind of pain that leaves a lasting impact on a person's life. It often stems from significant events or experiences that fundamentally change a person's perspective, behavior, or trajectory. This could include the loss of a loved one, a life-altering decision, a personal tragedy, or a moment of realization that leads to personal growth.

McCall suggests that while the pain that hurts may be difficult to endure, it is the pain that alters that truly shapes and transforms a person. This type of pain should be the one to choose and can lead to personal growth, self-reflection, and a reevaluation of one's priorities and values. It can serve as a catalyst for change and motivate individuals to take positive action or make different choices in their lives.

In essence, McCall's statement reflects the idea that pain is an inevitable part of life, but it is how we respond to and learn from that pain that determines our personal growth and transformation.