And his commandment is this: we should believe in the name of his Son, Jesus Christ, and love one another just as he commanded us.
Those who keep his commandments remain in him, and he in them, and the way we know that he remains in us is from the Spirit whom he gave us. (1 Jn 3:22-4:6)
https://bible.usccb.org/bible/readings/010625.cfm
“Believe in the Lord and love one another” make pretty good advice. Faith hasn’t gotten easier in 2,000 years. Yet we still rejoice in the Word Made Flesh and seek to fulfill his command.