“One of the questions raised by those who cannot yet see the need for Christian schools is whether it is not possible for a God-fearing child to know and hold the Truth even though the child attends a school where the Truth is not taught. After all, the child has the church and the home. The answer is that this is possible; indeed, it has often been the case, especially where Christian schools were impossible. But it is also the case that many children are weakened, and some even destroyed, spiritually. We must not underestimate the power of education, whether for good or for bad.
Although it is possible for covenant children to know the Truth and embrace it apart from Christian schools, we Christian parents cannot be content that our children receive instruction five days a week, seven hours a day, for some twelve or fifteen years, that opposes and undermines our teaching at home and at church. We are desirous that all the teaching be harmonious and complementary. We are convinced, with the wise Preacher, that a threefold cord of home, school, and church is not quickly broken (Eccl. 4:12).”
Excerpt from”The Necessity of good Christian schools” by Rev. David J. Engelsma.