One person may consider one day to be more sacred than another, while another may judge all days to be alike. Let everyone be convinced in his own beliefs.
In the same way, some think one day is more holy than another day, while others think every day is alike. You should each be fully convinced that whichever day you choose is acceptable.
You did not choose me. Rather, I chose you. And I appointed you to go out and bear fruit, fruit that will remain, so that the Father may give you whatever you ask him in my name.