Having sold over a million copies of his books within some ten years, the earnings were so great that in 1995 Girzone was able to acquire a 100-acre estate, with a 21-room Victorian mansion on it, in Altamont, New York, which he named Joshua Mountain. He founded there the Joshua Foundation, an organization dedicated to making Jesus better known throughout the world. Sacks of mail arrived for Girzone weekly from lapsed Catholics and spiritual seekers of all stripes showed up at his home to share how his books had affected their lives, and he would hold classes on spirituality there.