The "Introit" or "entrance" Psalm prayed in holy worship each Sunday helps to set the tone of the day.

The Introit for Sunday next comes from the 119th Psalm about which one cannot say too much. Every referent in it is Christ himself. He is the light, salvation, justice, word, instruction, judgments, and precepts etc. to which the Psalm makes constant reference in its 176 verses. To know it, is to know Christ as your Lord.

In particular is this verse: 

If your Law/Torah/Instruction had not been my delight
I would have perished in my affliction.

I will never forget your precepts,
for by them you have given me life.

While David's first reference may be to Moses' 5 books, the Law (as most English Bibles have it), Jesus himself is the Torah or instruction or Word of God. Had he not been our delight, the sole object of our faith, hope and love, then we would easily perish with every affliction that sin, Satan and death bring our way. 

But with Christ! our holy High Priest as our delight, Rock, Fortress and Strong Defense, affliction is but an annoyance. It is as Paul Gerhardt writes in his Easter Hymn: "Awake My Heart With Gladness" (LSB #467)

5 The world against me rages,
Its fury I disdain;
Though bitter war it wages,
Its work is all in vain.
My heart from care is free,
No trouble troubles me.
Misfortune now is play,
And night is bright as day.

And so may Sunday's Introit, the 119th Psalm and this hymn see you through your day today, in Christ.