Question

"And for the support of this Declaration, with a firm reliance on the protection of divine Providence, we mutually pledge to each other our Lives, our Fortunes, and our sacred Honor."

Why does Jefferson conclude with this statement?
to soften the impact of this document so that more readers agree with it
to leave an opening for future negotiations with the British
to show colonial support for the document and the willingness to fight for independence
to influence other nations in their own struggles for independence