Why are death and best personified in Life - Charlotte Bronte?

Answer: death: well, she's talking about death metaphorically as if it's a person. It's capitalized bc Death is a personification of death represented as a human-like concept.

Best: the capitalized Best is similar to the death. But it's her intent to tie the concept of the superlative metaphorically to a person. However, the difference is, it's an actual person not a personification of a concept