On JULY 26, 1775, Benjamin Franklin became the first U.S. Postmaster General, a position he held prior to the Revolution under the British Crown. He established a volunteer fire department, a circulating public library, an insurance company, a city police force, a night watch and a militia. He set up the lighting of city streets and coined the electrical terms "positive" and "negative." On June 28, 1787, as Governor of Pennsylvania, Benjamin Franklin hosted the Constitutional Convention in Philadelphia, where he moved: "That henceforth prayers imploring the assistance of Heaven, and its blessing on our deliberations, be held in this Assembly every morning." Franklin wrote April 17, 1787: "Only a virtuous people are capable of freedom. As nations become corrupt and vicious, they have more need of masters." Benjamin Franklin wrote his own epitaph: "THE BODY of BENJAMIN FRANKLIN - Printer. Like the cover of an old book, Its contents torn out, And stripped of its lettering and gilding, Lies here, food for worms; Yet the work itself shall not be lost, For it will (as he believed) appear once more, In a new, And more beautiful edition, Corrected and amended By The AUTHOR."