I wonder how many times you've sung 'Away in a manger?' It'll be a lot I warrant. If you are ordained, or in church ministry, or a primary school teacher it will be an awful lot.
What do you do when you are faced with inevitable repetition? Do you struggle along out of a sense of duty, not really paying attention to the words? Do you focus on a particular line or phrase and meditate upon it?
In this particular case I stick imaginary pins in the body of the lyricist who used the Christian message as a piece of polemic to suggest that good children don't cry. '...little Lord Jesus no crying he makes' is not in the Bible, boys and girls. Tears are OK.
Our traditional carols are nice as a background to Christmas but are full of a lot of manipulative tosh. Sing along like you'd sing along to Abba (if that is your bag). Don't swallow.