Southern Isabela Academy (SIA)

At the same time that Charles Selby was collaborating with church leaders in Santo Tomas, Isabela, to establish a new high school, Northern Isabela Academy, officials from a remote community further south, in San Guillermo, Isabela, offered to donate land for another high school, provided it could be built that same year. After prayerful consideration, Charles accepted this challenging opportunity. As he later remarked, “We didn’t have enough money to start one high school in 1967… so we started two.”

Once again, Charles arranged plans for a U-shaped building with three units, to be constructed sequentially. Trusting God’s provision as he had with previous ministry buildings, Charles initiated construction by faith. He hired teams to lay the foundation, and remarkably, donations and supplies arrived exactly as needed for each stage. By God’s grace, SIA opened its doors to students in 1967, simultaneously with NIA.

In the 57 years since opening day, SIA has produced over 4,600 graduates, and more than 3,850 students have accepted Jesus Christ as Lord and Savior and have been baptized. The school’s evangelistic efforts have significantly impacted students’ families and friends, leading many to Christ and resulting in the establishment of 12 new churches in the surrounding area.

Over 50 SIA graduates have attended or graduated from Bible colleges, serving in full-time or part-time preaching and teaching ministries. Numerous other graduates have become influential leaders within their churches, communities, businesses, professions, and various areas of society. Wherever they live, these graduates have strengthened local churches with members and leaders grounded firmly in biblical truths.

Prayer Requests

We believe in the power of prayer and invite believers to pray for each of our ministries.

Below you will find the current prayer request as provided by the leaders of this ministry!


  • Ask God to protect the school from harm and disaster. Pray that the campus remains a place of safety, peace, and joy for all who enter.
  • Pray for spiritual revival across the school community. Ask God to bless Bible hours, classes, and discipleship that deepen faith and ignite hearts.
  • Pray for the school's leaders to be Spirit-led and courageous. Ask God to give them vision and integrity as they make decisions that shape the academy.
  • Pray that students grow in wisdom and academic excellence. Ask God to guide teachers in delivering Christ-centered education that shapes both mind and character.
  • Pray for God's provision for the school's needs—student support, staff salaries, facilities, and materials. Ask for generous partners to help sustain its mission.

Academic Year Highlights


2024-2025

  • 631 students were enrolled, with 217 in grades 11-12, and 326 in grades 7-10, and 88 in grades k-6.
  • 89 students are set to graduate from the high school on March 31.
  • 43 students came to know Jesus Christ as Lord and Savior and were baptized.

2023-2024

  • 642 students were enrolled, with 223 in grades 11-12, and 327 in grades 7-10, and 92 in grades k-6.
  • 108 students are set to graduate from the high school in May.
  • 69 students came to know Jesus Christ as Lord and Savior and were baptized.