"Call on me in the day of trouble; I will deliver you, and you will honour me." (Psalm 50:15)
Psalm 50 is unusual in the Psalter: it is not a prayer addressed to God but a speech by God addressed to his people. The Mighty One, God, the Lord, speaks and summons the earth from the rising of the sun to where it sets. From Zion, perfect in beauty, God shines forth. He comes with fire, with tempest around him. He summons the heavens above and the earth to witness the judgment of his people. The setting is a covenantal courtroom: God is judge, heaven and earth are witnesses, and Israel is called to account.
The first charge is not ethical but liturgical, and it is unexpected: God does not need their sacrifices. I have no need of a bull from your stall or of goats from your pens, for every animal of the forest is mine, and the cattle on a thousand hills. The people have been offering sacrifices as though God needed to be fed, as though the ritual provided something to the divine. God rejects this transactional understanding of worship. He does not want their burnt offerings because he already owns everything they could possibly offer. What he wants is not sacrifice but relationship: call on me in the day of trouble; I will deliver you, and you will honour me.
The acceptable sacrifice is the sacrifice of thanksgiving, the todah: the acknowledgment of God's gifts received, the recognition of his faithfulness, the prayer that calls on him in distress. This is what genuine worship looks like: not the mechanical performance of ritual but the heart-engagement with the God who speaks and calls and delivers. The Catechism teaches that Christian worship, and the Eucharist in particular, is precisely this sacrifice of thanksgiving: we offer back to God what he has given us, in gratitude and trust (CCC 1359).
Brothers and sisters, God's invitation in Psalm 50 is beautifully simple: call on me in the day of trouble, and I will deliver you, and you will honour me. The calling, the deliverance, and the honouring form a single movement of the covenantal relationship. Your trouble is not a problem for God. It is an invitation to call. Call today. Whatever the trouble is, bring it to the one who speaks from Zion and delivers those who call.
Mighty Lord God, you summon the earth and call your people to account. We offer you the sacrifice of thanksgiving and call on you in our day of trouble. Deliver us and receive our honour. You have no need of our sacrifices; you desire our hearts. Here they are. Through Christ our Lord. Amen.