Samuel Miller (Manual of Presbytery, p. 133)
The observance of the uncommanded holy-days is ever found to interfere with the due sanctification of the Lord’s-day. Adding to the appointments of God is superstition; and superstition has ever been found unfriendly to genuine obedience. Its [adherents], like the Jews of old, have ever been found more tenacious of their own inventions, of traditionary dreams, than of God’s revealed code of duty. Accordingly, there is perhaps no fact more universal and unquestionable, than that the zealous observers of stated fasts and festivals are characteristically lax in the observance of that one day which God has eminently set apart for himself, and on the sanctification of which all the vital interests of practical religion are suspended.