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It's not that you have to hide it, the point which the Lord was trying to make was that one shouldn't brag about it in order to give some kind of senese of spiritual superiority. I used to have the same problem with my family. they always seemed to pressure me into breaking a fast before I was ready. But I simply let them talk and eventually it became clear that I was going to do what I felt the Lord would have me do regardless of their reactions. They finally accepted it.