The Roman Catholic Church, according to the General Roman Calendar, celebrates the following in Sunday, 2018-01-21:
1 Corinthians 1:26-31
26For consider your call, brethren;not many of you were wise according to worldly standards, not many were powerful, not many were of noble birth;27but God chose what is foolish in the world to shame the wise, God chose what is weak in the world to shame the strong, 28God chose what is low and despised in the world, even things that are not, to bring to nothing things that are, 29so that no human being might boast in the presence of God. 30He is the source of your life in Christ Jesus, whom God made our wisdom, our righteousness and sanctification and redemption;31therefore, as it is written, "Let him who boasts, boast of the Lord."
Psalms 23:1-6
1The LORD is my shepherd, I shall not want;2he makes me lie down in green pastures. He leads me beside still waters;3he restores my soul. He leads me in paths of righteousness for his name's sake. 4Even though I walk through the valley of the shadow of death, I fear no evil;for thou art with me;thy rod and thy staff, they comfort me. 5Thou preparest a table before me in the presence of my enemies;thou anointest my head with oil, my cup overflows. 6Surely goodness and mercy shall follow me all the days of my life;and I shall dwell in the house of the LORD for ever.
Matthew 13:44-46
44"The kingdom of heaven is like treasure hidden in a field, which a man found and covered up;then in his joy he goes and sells all that he has and buys that field. 45"Again, the kingdom of heaven is like a merchant in search of fine pearls, 46who, on finding one pearl of great value, went and sold all that he had and bought it.
Jon 3:1-5, 10
The word of the LORD came to Jonah, saying:
"Set out for the great city of Nineveh,
and announce to it the message that I will tell you."
So Jonah made ready and went to Nineveh,
according to the LORD'S bidding.
Now Nineveh was an enormously large city;
it took three days to go through it.
Jonah began his journey through the city,
and had gone but a single day's walk announcing,
"Forty days more and Nineveh shall be destroyed, "
when the people of Nineveh believed God;
they proclaimed a fast
and all of them, great and small, put on sackcloth.
When God saw by their actions how they turned from their evil way,
he repented of the evil that he had threatened to do to them;
he did not carry it out.
Ps 25:4-5, 6-7, 8-9
R. (4a)
Teach me your ways, O Lord.
Your ways, O LORD, make known to me;
teach me your paths,
Guide me in your truth and teach me,
for you are God my savior.
R.Teach me your ways, O Lord.
Remember that your compassion, O LORD,
and your love are from of old.
In your kindness remember me,
because of your goodness, O LORD.
R.Teach me your ways, O Lord.
Good and upright is the LORD;
thus he shows sinners the way.
He guides the humble to justice
and teaches the humble his way.
R.Teach me your ways, O Lord.
1 Cor 7:29-31
I tell you, brothers and sisters, the time is running out.
From now on, let those having wives act as not having them,
those weeping as not weeping,
those rejoicing as not rejoicing,
those buying as not owning,
those using the world as not using it fully.
For the world in its present form is passing away.
Mk 1:14-20
After John had been arrested,
Jesus came to Galilee proclaiming the gospel of God:
"This is the time of fulfillment.
The kingdom of God is at hand.
Repent, and believe in the gospel."
As he passed by the Sea of Galilee,
he saw Simon and his brother Andrew casting their nets into the sea;
they were fishermen.
Jesus said to them,
"Come after me, and I will make you fishers of men."
Then they abandoned their nets and followed him.
He walked along a little farther
and saw James, the son of Zebedee, and his brother John.
They too were in a boat mending their nets.
Then he called them.
So they left their father Zebedee in the boat
along with the hired men and followed him.