For I was not only carefull to direct all my thoughts in generall according to its rules, but I from time to time reserv'd some houres, which I particularly employd to practice it in difficulties belonging to the Mathematicks, loosening from all the principles of other Sciences, which I found not stable enough, as you may see I have done in divers explain'd in my other following discourses.
izan ere, nire pentsamenduak bere arauei jarraituz zuzentzeko arreta nuen arren, noizean behin ordu batzuk hartzen nituen matematikaren arazoetan jarduteko (edo antzerakoak izan zitezkeen beste zientzia batzuen arazoetan ere).