28th Sunday in Ordinary Time, Year C – Oct. 12, 2025
2 Kings 5:14-17; 2 Timothy 2:8-13; Luke 17:11-19
Theme: From the Faith the Size of a Mustard Seed to the Faith of Thanksgiving and Discipleship
A. A Brief Exegetical Analysis of Luke 17:11-19
1. Historical and Literary Contexts
Luke aims to guide his readers from the “faith the size of a mustard seed,” meaning for beginners, which he previously taught them (17:5-10), to the “faith of thanksgiving and discipleship” that he develops in this Gospel passage. This higher level of faith is linked to salvation in the kingdom of God, which will come someday, the topic discussed in the passage that follows our story (17:20-37).
2. Form, Structure, and Movement
This Gospel story can be divided into three parts: the setting (v. 11), Jesus with all ten lepers (vv. 12-14), and Jesus with one leper, a Samaritan (15-19).
3. Detailed Analysis
V. 11. This journey of Jesus to Jerusalem will culminate in his Passion, Death, Resurrection, and Ascension.
Vv. 12-14. The ten lepers simply raise their voices and ask Jesus to heal them. This simple faith illustrates "faith the size of a mustard seed,” which refers to beginner-level faith that Jesus encouraged his disciples to start with in the previous story (17:5-10). Jesus’ instructions to these lepers regarding showing themselves to the priests refer to Lv 14:2-9. The priests were the ones who legally signed the bills, either to confirm the skin diseases, which were all considered leprosy, and to expel the contaminated person from society, or to confirm the miraculous healing and admit a healed person back into the community (see Lv 13:45-46, 49; Nm 5:2-3).
Vv. 15-19. All ten lepers are healed as they go to show themselves to the priest to receive official notice of their miraculous healing. Nine of them, excited to reunite with their community, families, relatives, and friends, fail to return and thank Jesus, who healed them. Only one, a Samaritan, who, before rejoicing with his family and others, returns to Jesus and offers three types of prayers: “Glorifying God in a loud voice’ (v. 15b) is a prayer of praise; “Falling at Jesus’ feet” (v. 16a) is a prayer of adoration; and “Thanking Jesus” (v. 16a) is a prayer of thanksgiving. In v. 18, Luke teaches two lessons. (1) By identifying this one leper as a Samaritan and a foreigner, Luke emphasizes the universality of salvation: Jesus extends salvation to everyone, including non-Jews. (2) With the phrase “... to give thanks to God,” while this Samaritan gives thanks to Jesus instead, Luke shows that Jesus is God. Luke ends this story by linking the faith of gratitude and discipleship with salvation: “Stand up and go; your faith has saved you” (v. 19).
The beginner-level faith (faith the size of a mustard seed) is necessary to start living out Jesus’ teachings (see 17:5-6) and to receive physical healing (cf. these ten lepers). However, believers should elevate their faith to one of thanksgiving and discipleship to be saved.
This Samaritan echoes Naaman in today’s first reading (2 Kgs 5:14-17). After he realized he was healed from leprosy, Naaman returned to Elisha, the man of God, to do two things: he thanked God and decided to start his relationship with God.
4. Synthesis
With their beginner-level faith (faith the size of a mustard seed, cf. Lk 17:5-6), ten lepers pray to Jesus for healing, and Jesus heals them. None of them return to thank him except one, a non-Jewish Samaritan. This foreigner elevates his beginner-level faith to a faith of thanksgiving and discipleship by returning to Jesus and offering three kinds of prayer: praise, adoration, and thanksgiving. Because of this, Jesus grants him salvation of his soul in addition to physical healing.
B. Pastoral Implications
1. Liturgical Context
In last Sunday’s Gospel, Jesus encouraged his disciples and us not to expect a spectacular faith before we start practicing all his teachings. He assured us that the “beginner-level faith,” which he called “faith the size of a mustard seed,” can “uproot a mulberry tree and plant it in the sea.” This saying means that with this simple faith, we can achieve remarkable things, such as following his teachings. Today, he challenges his disciples and us to raise our “beginner-level faith” to a higher level, one of “thanksgiving and discipleship,” like the Samaritan leper (Gospel), Naaman (first reading), and Saint Paul (second reading).
2. What the Church Teaches Us Today
First, we should raise our “beginner-level faith” to a faith of thanksgiving. Because of their contagious disease, the ten lepers were isolated. Their faith, the size of a mustard seed (simply praying to Jesus for healing), was enough to “uproot” the mulberry tree of their leprosy from their bodies and “uproot” them from their isolated position and “replant” them into society again. However, only one of them, a non-Jewish Samaritan, raises his faith to a higher level—one of thanksgiving—by returning to Jesus and offering him three types of prayer: he glorifies God loudly (prayer of praise), falls at Jesus’ feet (prayer of adoration), and thanks him (prayer of thanksgiving). This foreign Samaritan echoes Naaman in the story from our first reading. After he realizes that he is healed of his leprosy, Naaman elevates his “beginner-level faith” to a faith of thanksgiving by returning with his whole retinue to the man of God, Elisha, and offering gifts as a sign of thanksgiving to God.
Here, the Church teaches us that our leprosy of sins separates us from God and our Church community. When we confess our sins with our beginner-level faith, God’s mercy “uproots” us and “plants” us again in our relationships with him and our brothers and sisters. However, sadly, we notice that only a few Christians return to God to express their gratitude at Mass, especially on Sundays. Many, like the nine lepers of our Gospel, prefer to go their own way. The Church reminds us that attending Mass is our best way of returning to Jesus and expressing our gratitude to him. Let us elevate our “faith the size of a mustard seed” to the level of the faith of thanksgiving.
Second, the Church encourages us to elevate our faith, not only to the level of thanksgiving faith, but also to the level of discipleship. In addition to thanking Jesus, the Samaritan leper of our Gospel also praises and adores him. This shows his discipleship faith. Similarly, Naaman, in our first reading, moves toward discipleship faith when, in addition to thanking God, he decides to serve only the Lord. He demonstrates this decision by taking two mule loads of earth, since at that time, people believed God was connected to the soil of the Holy Land. He promises to build an altar with it in his homeland of Aram and start offering burnt sacrifices to the Lord on it.
We also receive many blessings from God, especially the forgiveness of our sins and the restoration of our relationships with him and our brothers and sisters. Therefore, we are called to begin and deepen our relationship with God by serving him. Our faith in God should go beyond simply asking for his favor (the beginner-level faith) and giving thanks; it should also develop into discipleship.
The “beginner-level faith” helps us start living out Jesus’ teachings, lift up our prayers to him, and receive various blessings we need for our lives in this world. However, the faith of thanksgiving and discipleship helps us attain the salvation of our souls. This is what happened with the Samaritan leper. When Jesus sees in him the desire to stay in a relationship with him, he tells him, “Stand up and go; your faith has saved you.” The faith accompanied by thanksgiving and a desire to be in a permanent relationship with Jesus has brought this Samaritan leper not only physical healing but also, especially, eternal salvation. In our second reading, Saint Paul also reassures us of eternal salvation. He tells Timothy and us how he suffers, even to the point of chains in prison like a criminal, for the sake of the Gospel. He exhorts us to persevere in following Jesus, as he did.
May the liturgy of this Mass inspire us to elevate our “faith the size of a mustard seed” to higher levels, of thanksgiving and discipleship. Amen.
Fr. Leon Ngandu, SVD
Pastor of Holy Family Catholic Church, Jackson, MS &
SVD USS Biblical Apostolate Coordinator