I entreat you, O Lord, holy Father, everlasting God, command the way of your truth and the knowledge of you to be shown to your servants who wander in doubt and uncertainty amid the darkness of this world; that the eyes of their souls may be opened, and they may acknowledge you, the One God, the Father in the Son, and the Son in the Father, with the Holy Spirit, and enjoy the fruit of this confession, both here and in the world to come; through Jesus Christ our Lord.
Gregorian according to Pamelius

1 Sing joyfully to the LORD, you righteous;
it is fitting for the upright to praise him.
2 Praise the LORD with the harp;
make music to him on the ten-stringed lyre.
3 Sing to him a new song;
play skillfully, and shout for joy.
4 For the word of the LORD is right and true;
he is faithful in all he does.
5 The LORD loves righteousness and justice;
the earth is full of his unfailing love.
Psalm 90 New International Version

Readings for today from the Daily Lectionary
(click on underlined link to go directly to the reading):
Amos 3:1-11 – 2 Peter 1:12-21 - Matthew 21:12-22