Mgr. Hendriks of Haarlem-Amsterdam will celebrate his first Pontifical Latin Mass in the 1962 Rite on the 20th of September in Amsterdam
. Lex orandi, lex credendi (Latin: "the law of what is prayed [is] the law of what is believed"), sometimes expanded as Lex orandi, lex credendi, lex vivendi (Latin: "the law of what is prayed [is] what is believed [is] the law of what is lived"), is a motto in Christian tradition