This article is an edited version of the keynote address delivered by Dr. Jongsma at the B.J. Haan Education Conference on Teaching Math in the Christian School, held at Dordt College on March 9, 2006, for elementary and secondary school mathematics teachers, primarily in Christian schools. The article was earlier published online in the 2006 Journal of the ACMS (http://www.acmsonline.org/Jongsma.htm)
