A manager is a person or a personnel in any organization or firm who is responsible for administering or controlling the activities of the organization or the firm.
They have the powers and responsibilities that is granted by the organization. A manger is mainly responsible for such things that includes staffing and assigning work tasks, and and also to monitor the results. They are the one who secures resources, do planning, execute the strategies and organize the activities.
Thus in the context, Tim is given the responsibility to staff the team, delegate the responsibilities and authorize the plans and strategies. He is also responsible for monitoring the results. Thus Tim is in the position of a manager.
basically, the quote is saying to take the unlucky bad things and make something good outta it. when life gives you lemons means when life gives you hardships. you make lemonade means you make something good out of the hardships. Hence the meaning of "when life gives you lemons you make lemonade."
It effects the reader because the tone in the story can effect their emotions and certain words can have a different effect. The reader becomes more upset and negative when reading about negative things. The reader would feel more positive if the book talked about more positive things because of the same reasons it would effect someone in a negative way; certain tones and words