The principal expression of our worship to God is that of the Mass. From the Introductory Rites, to the Liturgy of the Word, to the Liturgy of the Eucharist and ending with the Concluding Rite are all part of our praise and thanksgiving offering.
Mass was instituted by Christ himself at the Last Supper and by participating we confer the graces needed from God’s mercy to expiate the sins of the past and the graces needed from God’s bounty to obtain His blessings for the future.
But it is not this way among you, but whoever wishes to become great among you shall be your servant; and whoever wishes to be first among you shall be slave of all.
For even the Son of Man did not come to be served, but to serve, and to give His life a ransom for many.