"Remember that you are mortal, and you have a limited time to live, and in devoting yourself to discussion of the nature of time and eternity you have seen things that have been, are now, and are to come."
It would definitely be interesting to see which sections he found worthy of comment. i guess this would be our english source? M. A. Screech, Montaigne's annotated copy of Lucretius: a transcription and study of the manuscript, notes and pen-marks (Genève, 1998)