As the story begins, we learn that Harold is wise enough to avoid trouble—a sign of self-preservation. His father's factory is closing in difficult financial times, and Harold arrives with care.
Better not to arrive in a taxi, he was thinking. The old man will wonder where I got the money.
We also learn that money is an issue. We might believe it is only because his father's business is failing, but Harold's description of family life says a great deal as to how money is always an issue; it also shows how Harold is able to rise to the occasion and be supportive in face of this disaster in his less-than-loving father's life.
Suddenly all the money quarrels of the family, which nagged in the young man's mind, had been dissolved. His dread of being involved in them vanished. He was overcome by the sadness of this father's situation...I must see him. I must help him. All the same, knowing his father, he had paid off the taxi and walked the last quarter of a mile.
Harold is a good soul because even though he is aware of how his father feels about him, he is present on the day the business will officially close. His father's attitude is expressed in his nickname for his son:
"Come in, Professor," said the father. This was an old family joke. He despised his son, who was, in fact, not a professor but a poorly paid lecturer at a provincial university.
Harold is an educated man. He has a job, but his father's snobbery (it would seem) has relegated his son to an inferior position within society. His father does not resent the fact that his son has to struggle to get by (which would show concern on the father's part), but resents that his son is not success in the world of money—seemingly the father's "god."
Harold is long-suffering.