Answer:
Reflection, in any essay, usually refers to a taking stock of things in general, a pause to philosophically ponder the larger situation. A reflective personal essay might contain thoughts on one's situation in life, or one's motives as determined by past events, or the death of a loved one or, of course, on beauty and joy as well. Quality reflection, "knowing oneself", is a characteristic of a mature writer and individual, and a good essay can cause readers to gain insight into both human nature and themselves.