He that regards the day, regards it unto the Lord; and he that regards not the day, to the Lord he does not regard it. He that eats, eats to the Lord, for he gives God thanks; and he that eats not, to the Lord he eats not, and gives God thanks.
All Commentaries on Romans 14:6 Go To Romans 14
Clement Of Alexandria
AD 215
And a little way on he explains the reason of the command, when he says, "He that eateth, eateth to the Lord, and giveth God thanks; and he that eateth not, to the Lord he eateth not, and giveth God thanks."