Some people think that a certain day is more important than other days, while others think that all days are the same. We each should firmly make up our own minds. Those who think highly of a certain day do so in honor of the Lord; Romans 14:5-6a NIV
Just for a heads up, isn't that in the chapter context of eating meats offered to idols? The verse sounds good standing alone, but certain believers were not comfortable eating meat certain days if in the market they were possibly from the same source offered to idols. So on the days they were offered, they stayed away from eating the meat. Other believers didn't care what day it was.
This verse is also misquoted with the one about not judging one regarding a Sabbath, New Moon or feast. Most people think that means that one does not have to keep them. However, if that were the case, then why does Paul mention that unless they were observing them? They were not to be judged because they already
kept them, and in addition regarding the
manner they keep them. I often bring up the topic of feasts on forums like this, and (Christian) people retort that I don't have to keep them and I am being 'legalistic'. I then take this verse to comfort where I am to let no one judge me regarding a Sabbath, a new moon, or feast (I constantly keep track of the new moon in Israel when it's proclaimed).
And yet another is Paul's statement, "You observe days and months and seasons and years"...
The Sabbath and feasts were never mentioned here (as was the previous example), and nobody was even keeping the Sabbatical or Jubilee years back then, so he was not referencing the feasts and Sabbaths of the Lord, but the translation are civil days and special days from other backgrounds, as the Galatians were from a Gentile background. Today's equivalent might be Christmas or some other secular holiday when one is converted from that and goes back again is exactly what the Galatians were starting to do again. So for those who rail me over the feasts, I then can quote back to those keeping the likes of Christmas, Lent and others based on other gods:
You are observing special days and months and seasons and years! 11 I fear for you, that somehow I have wasted my efforts on you.