In many contexts, the use of the words "personal" and "personally" is unnecessary because the situation already indicates that someone is acting as an individual rather than a representative. For example, when Dr. Leonard chooses to visit a parish involved in a dispute, it is implicit that he is making this decision on his own, so stating that he is visiting "personally" adds little value to the sentence.
Additionally, phrases like "personal friend," "personal opinion," and "personal favorite" often lack clarity or necessity, as the word "personal" does not contribute meaningfully to the description. According to Bill Bryson's "Troublesome Words," these usages can be considered redundant and should be used with care to avoid cluttering language.