Read the following passage and answer the given question.

In many instances, the mindset of a person can restrict another person's ability to become an excellent performer. This cause and effect model applies to all aspects of our lives. My neighbor's young son asked if he could mow my yard. I told him I would talk to his dad first. The father said, "I don't think he can handle a mower. I never let him near mine. Go ahead if you like". I assured him I would watch his son closely and be certain he could handle the equipment safely. The boy not only knew to handle the mower, but did such a good job, I asked him to help each week. His dad was amazed. "I never would have guessed", he said. "You should have given him a chance", I suggested.

Q$.$ Which one of the following suggestions is not implied in the passage?