Psalms 50:15

And call upon me in the day of trouble: I will deliver thee, and thou shalt glorify me.

Ver. 15. And call upon me] These two, praising God for what we have, and praying for what we want, do take up the whole duty of man; a holy trade is hereby driven between heaven and earth, and sweet intercourse maintained between God and man.

In the day of trouble] At any time, but then especially; the time of affliction being the time of supplication; for then we are fittest to call, and then God is readiest to give answer, then we may have anything, Zechariah 13:9 .

I will deliver thee] It is but ask and have; and surely he is deservedly miserable who will not make himself happy by asking. When there was a speech among some holy men what was the best trade? One answered, beggary; it is the hardest and richest trade (Dr Preston). Common beggary is indeed the easiest and poorest trade; but prayer he meant, it is like the ring given a nobleman in this land by Queen Elizabeth, with this promise, that if he sent that ring to her at any time when he was in distress she would remember and deliver him. He sent it, but it never came to her hands; but prayer never miscarrieth.

And thou shall glorify me] Servati sumus, ut serviamus, Luke 1:74. And yet it is ten to one that any returneth, with the leper, to give God the glory of a deliverance. Plerique ut accipiant importuni, donec acceperint inquieti, ubi acceperint ingrati, saith Bernard truly: Most men are importunate that they may receive good at God's hands, restless till they have it, and are careless to return thanks afterward (De Consid. l. 4). Out upon such an ingratitude, hateful even among heathens.