What central idea does Henry develop in paragraph 3 to strengthen his argument? in…

What central idea does Henry develop in paragraph 3 to strengthen his argument?
in Speech to the VIRGINIA CONVENTION by Patrick Henry
this is the paragraph
I have but one lamp by which my feet are guided, and that is the lamp of experience. I know of no way of judging the future but by the past. And judging by the past, I wish to know what there has been in the conduct of the British ministry for the last ten years to justify those hopes with which gentlemen have been pleased to solace themselves and the House. Is it that insidious smile with which our petition has been lately received? Trust it not, sir; it will prove a snare to your feet. Suffer not yourselves to be betrayed with a kiss. Ask yourselves how this gracious reception of our petition comports with those warlike preparations which cover our waters and darken our land. Are fleets and armies necessary to a work of love and reconciliation? Have we shown ourselves so unwilling to be reconciled that force must be called in to win back our love? Let us not deceive ourselves, sir. These are the implements of war and subjugation; the last arguments to which kings resort.