The poem which is the 'we grow accustomed to the dark' in the end, is trying to tell us that even in darkness in which it could represent the darkest days in our life or depressing days that happens to our lives, we could still manage to get through it as life goes on for us and there is always tomorrow which represents the last line as it says that 'in life, steps almost straight'.
I believe the answer is: knowing your purpose
By knowing your purpose, you could determine the type of approach that would be best for the presentation, the target audience that you should seek and the type of material you could give in order to make sure that the audiences receive the full message of the presentation.
T<span>he Medici were a family of Bankers. They had banks throughtout Europe and were the official bank of the Pope. The connection to the Pope made them respected by others who decided to bank with them as well. They became extremelly wealthy and powerful. </span>
<span>Florence was home to the Medici and it prospered due to their patronage and many commssions in the areas art art, science, philosophy, etc...</span>