Which of the following lines from section 10 is an aphorism?

a. aphorisms are statements of truth about life.
b. if a thousand men were not to pay their tax-bills this year, that would not measure.
c. this is, in fact, the definition of a peaceable revolution, if any such is possible.
d. through this wound a man's real manhood and immortality flow out, and bleeds...everlasting death."