Despite having some indecisiveness about his future, in 1902 Machen opted to study theology at Princeton Seminary, while simultaneously studying a Master of Arts in Philosophy at Princeton University.
Trotz einer gewissen Unschlüssigkeit bezüglich seiner Zukunft entschied sich Machen 1902, Theologie am Princeton Theological Seminary zu studieren, während er gleichzeitig einen Master of Arts in Philosophie an der Princeton University machte.