Can you provide some details about the 'Mr Jones be gentle' story?
Sorry, I don't have enough information to give a definite answer. It could be about a Mr Jones in a small town who is usually rough around the edges but is asked to be gentle when dealing with a new neighbor who is very sensitive.
The 'Mr Jones be gentle' story might be set in a school environment. Mr Jones could be a strict teacher, and a student or another teacher tells him to be gentle. Maybe he has been too hard on the students with his grading or discipline, and this plea is a reminder to be more kind - hearted. For instance, if a student has made a small mistake, instead of giving a harsh punishment, he should be gentle and offer some guidance instead.
One potential story for 'Mr Jones be gentle' could be in a medical context. Mr Jones is a doctor who is known for his brusque manner. A patient, especially a young or very ill one, needs a more gentle approach. So the nurses or the patient's family might say 'Mr Jones be gentle'. He then has to learn to change his bedside manner to be more comforting and less intimidating to the patient, perhaps by speaking softly, explaining procedures more carefully, and showing more empathy.