Answer:
A period
Step-by-step explanation:
In "since feeling is first", the last line states that "death is not a parenthesis." This line suggests that death is not a pause or interruption in life, but rather an integral part of it. It may imply that death is a continuation or completion of life, rather than its end. Alternatively, it could mean that death is not a mere aside or trivial matter, but rather something of great significance that cannot be ignored. The exact meaning of this line may vary depending on the interpretation of the reader.