Here's a little more of "Numbers" preceding that translation: "M. Stifel still wrote, in his 'Arithmetica integra' of 1544... 'Just as an infinite number is no number, so an irrational number is not a true number, because it is so to speak concealed under a fog of infinity'. This 'fog of infinity' is already defined rather more precisely by Stevin... as an infinite sequence of decimal fractions, representing a sequence of nested intervals, which he develops, for example, in finding successive approximations to the solution of the equation x^3 = 300x + 33900000."
A Springer book called "Numbers" (1991, Ebbinghaus, et al.) translates "Et procedant ainsi infiniment, l’on approche infiniment plus pres au requis" as "and proceeding in this way unendingly, one approaches infinitely closer to the required value".