Quintus: "I'm a soldier, I obey"

Maximus: "Nothing happens to anyone that he is not fitted by nature to bear"

What does Maximus mean with this? Is it a jab at Quintus? Could Quintus have decided, perhaps, "to not obey", and bear his burden that is bestowed upon by nature, that anyone can bear?

02:00 Maximus uses force and power necessary but resorts to being gentle and reserves power