'Lex Orandi Lex Credendi' is a latin phrase meaning, 'As we worship, so we believe.' The primary, and highest form of worship offered to God on earth is the Holy Sacrifice of the Mass. The four main ends of mass are: Adoration, Atonement, Thanksgiving, and Petition.
"And taking bread, he gave thanks, and brake; and gave to them, saying: This is my body, which is given for you. Do this for a commemoration of me." - Luke 22: 19
