Et nobis quidem ipsis, qui hoc opus breviandi causa suscepimus, non facilem laborem, immo vero negotium plenum vigiliarum et sudoris assumpsimus.
And as to ourselves indeed, in undertaking this work of abridging, we have taken in hand no easy task; yea, rather a business full of watching and sweat.
Et ad nos quidem ipso, qui suscipe hoc brevia causa opere, non faciliori labore, immo vero negotio plena de vigileas et de sudore assume.