A couple once told us they didn't like the church we go to because we don't observe or take communion every time we meet.
(We take communion on the first Sunday of the month.)
I thought it was odd because they made the comment when they themselves weren't attending church at all.
When we asked them how they take communion since they don't go to church they told us the have communion in the kitchen at their house.
(I don't think they fully understood how ridiculous they sounded.)
I guess they were fully convinced in their own minds.
One person considers one day more sacred than another; another considers every day alike. Each of them should be fully convinced in their own mind.