What is the meaning of the term "discretionary discretion" in the context of personal injury cases?

"The term 'discretion' denotes the absence of a hard and fast rule. The Styria v. Morgan, 186 U.S. 1, 9 (22 S.Ct. 731, 46 L.Ed. 1027). When invoked as a guide to judicial action it means a sound discretion, that is to say, a discretion exercised not arbitrarily or willfully, but with regard to what is right and equitable under the circumstances and the law, and directed by the reason and conscience of the judge to a just result."