Primus inter pares—The first among equals.
Primus sapientiæ gradus est falsa intelligere—The first step towards wisdom is to distinguish what is false.
Princes and lords are but the breath of kings, / 55 "An honest man's the noblest work of God." Burns.
Princes and lords may flourish or may fade; / A breath can make them, as a breath has made. Goldsmith.
Principes mortales, rempublicam æternam—Princes are mortal, the republic is eternal. Tac.
Principibus placuisse viris non ultima laus est—To have earned the goodwill of the great is not the least of merits. Hor.
Principiis obsta; sero medicina paratur, / Cum mala per longas convaluere moras—Resist the first beginnings; a cure is attempted too late when through long delay the malady has waxed strong. Ovid.
Principis est virtus maxima nosse suos—It is the greatest merit of a prince to know those his subjects. Mart.
Principle is a passion for truth. (?)
Principle is ever my motto, not expediency. Disraeli.