In English
Do not overdo anything, be moderate
means that all your thoughts and deeds and words on those holy days must be about God, that you should spend the day 'near' Him, 'in' Him, 'for' Him. It means that eating, sleeping and other bodily avocations have to take to secondary role, and the meditation and have to take the main role. If your body wastes away as a result of these fasts, God will be blamed; so, you are only drawing down the calumny of people on the God you adore. They will come to you and say, What! Before you started this , you were looking much better; now, you have become so thin and frail; you can scarcely move ! And they continue talking against Me in the same strain.