@jeremykong,
For what it's worth, here's what I get out of it.
First, it should be "signoria", not "sognoria". This is a reference to the
Piazza della Signoria, where Savaronola was executed.
Savoronola has apparently been given something to drink.
He thanks them. He says that the rack, an instrument of
torture, can make a cripple of you in less than an hour and
that the pain will constrict your throat. Therefore, he will
say what he has to say now, while he still can. He addresses
his words to the citizens of Florence who are celebrating
his execution day as a holiday.
Painting of Savonarola's execution in the Piazza della Signoria.